CN114026290B

CN114026290B - Tool rest system, milling roller and ground milling machine

Info

Publication number: CN114026290B
Application number: CN202080047394.XA
Authority: CN
Inventors: S·瓦克斯曼; M·伍尔夫
Original assignee: Bomag GmbH and Co OHG
Current assignee: Bomag GmbH and Co OHG
Priority date: 2019-06-28
Filing date: 2020-06-26
Publication date: 2023-08-29
Anticipated expiration: 2040-06-26
Also published as: US20220341105A1; CN114026290A; WO2020259867A8; DE102019008156A1; WO2020259866A1; WO2020259867A1

Abstract

The invention relates to a tool carrier system comprising a milling tool, a tool carrier and a clamping mechanism, in particular a clamping screw. The invention also relates to a milling roller and a floor milling machine with a tool carrier system.

Description

Tool rest system, milling roller and ground milling machine

Technical Field

The invention relates to a tool carrier system, a milling roller and a ground milling machine.

Background

Milling tools and tool carrier systems are also used in particular in the context of repair measures for streets when milling street signs and road surfaces, in particular asphalt road surfaces. A so-called floor milling machine, in particular a road cold milling machine, is used here. These floor milling machines generally comprise milling rollers equipped with milling cutters, which in operation descend about their axis of rotation which extends horizontally and transversely to the operating direction of the floor milling machine, onto the floor base to be milled. Such a floor milling machine with such a milling roller is described, for example, in DE102012022879A1, which is incorporated by reference.

The milling roller is equipped with a milling tool, usually by means of a so-called cutter holder, which is designed to receive and support the milling tool on the milling roller. The holder fastened directly or indirectly to the outer circumferential surface of the carrier tube of the milling roller and the milling tool, in particular held directly in the holder, together form a holder system. These tool holders can be connected directly to the carrier tube of the milling roller or can be designed as so-called replacement brackets, which in turn are supported on a base part connected to the carrier tube of the milling roller. In the prior art, a large number of milling tools and tool holders are described, wherein a group of milling tools that can be rotatably mounted in the tool holder and a group of milling tools that are mounted in the tool holder in a rotationally fixed manner can be found. The invention relates to a construction of a milling tool and a tool holder or a tool holder system, which are provided in particular for the rotationally fixed support of a milling tool. On the one hand, the anti-rotation, in particular direct, support of the milling tool in the tool holder has the advantage that wear phenomena occurring as a result of the relative movement of the milling tool on the tool holder are reduced or eliminated. On the other hand, milling tools having so-called PCD tips (polycrystalline diamond) are increasingly used in addition to milling tools having hard metal tips. Such a nose is characterized by its remarkable resistance to wear and thus a remarkably prolonged service life with respect to conventional milling tools. In particular, it is preferable for such milling tools to be mounted in the tool carrier in a rotationally fixed manner in order to reduce wear between the milling tool and the tool carrier and to enable, for example, even rotationally asymmetrical tip shapes on the milling tool.

A holding system is known from WO2014033227A2, in which the nose holding body is fixed against relative rotation by means of a friction fit by means of a fastening screw which is rotatable relative to the nose from behind along the longitudinal axis. WO2014072345A1 discloses a milling tool with a refill holder, which is fastened by means of countersunk screws which can be screwed into a further refill holder obliquely to the longitudinal axis of the refill holder. A disadvantage of these systems is, on the one hand, that they have to be partially accessible from behind in order to loosen the fastening screw, which is disadvantageous when the milling roller is tightly equipped with a milling tool, for example in the case of finish-milling rollers. On the other hand, the force output from the milling tool onto the tool holder is partially optimized.

Disclosure of Invention

Starting from this, the object of the present invention is to provide a possibility for further optimizing the tool holder of the known milling tool and tool holder system, in particular with regard to its use on a finish-milling roller and at the same time with regard to a simplified assembly and disassembly process.

This object is achieved by a tool holder system, which comprises a milling tool, a tool holder and a clamping device,

The milling cutter includes:

a cutting insert having a cutting tip, wherein the cutting insert widens in a head region away from the cutting tip along a longitudinal axis of the milling cutter in a radial direction relative to the longitudinal axis,

an abutment region abutting onto the head region, the abutment region being configured to abut onto the tool holder, the abutment region having at least in part an abutment cone tapering in a radial direction in a direction away from the tool tip,

a stem region adjacent to the abutment region,

a clamping area adjacent to the shank area,

wherein the milling tool has a guide recess in the clamping region, into which the clamping means are inserted,

the tool holder generally configured to hold a sleeve includes:

a) The milling cutter of the end side is provided with an accommodating opening,

b) A shank receiving cavity adjoining the milling cutter receiving opening in the direction of the push-in axis of the milling cutter and extending into the interior of the holding sleeve,

c) And a clamping means opening extending transversely to the push-in axis of the shank receiving cavity, said clamping means opening providing an access connection from the outer side of the holding sleeve surrounding the push-in axis up to the shank receiving cavity, and through which clamping means opening the clamping means can be inserted for securing the milling tool in the tool holder,

Wherein,,

a through-hole is present in the shank in the clamping area,

the tapered clamping element is introduced from outside the tool holder into the clamping element opening, passes completely through the through-opening of the tool shank along the screwing axis and is screwed into an internal thread in the interior of the tool holder opposite the clamping element opening,

the clamping means opening has an internal thread for engagement by the clamping means thread,

the guide recess is configured as a conical through-hole, the longitudinal axis or the conical axis of which extends obliquely to the insertion axis and/or the longitudinal axis,

when the clamping means is screwed in, the clamping means sliding on the inner side of the guide recess causes a tensile force acting on the milling tool via the conical guide recess, via which the abutment cone is pulled towards the cone abutment surface of the cone bearing cavity of the tool holder.

The object is also achieved by a milling roll having at least one tool carrier system according to the invention.

This object is also achieved by a floor milling machine having a milling roller according to the invention.

In view of the entire disclosure of the present invention, a further invention resides in the specific design of the milling cutter for a floor milling machine, the specific design of the mounting unit with such milling cutter and clamping screw, the specific design of the tool holder, the structure of the milling cutter together with the tool rotating tool and the method for mounting the milling cutter in the tool holder, as follows.

The tool holder system according to the invention comprises a milling tool, a tool holder and a clamping mechanism, in particular a clamping screw. The tool holder is configured to at least partially receive a milling tool. The clamping mechanism serves to detachably, in particular rotationally fixed, the milling tool in a defined relative position with respect to the tool holder, wherein this is preferably achieved by tightening the clamping mechanism to apply a clamping force which acts on the milling tool positioned in the tool holder.

According to the invention, the milling tool comprises: a cutting insert having a cutting tip, which widens in a head region away from the cutting tip along a longitudinal axis of the milling tool in a radial direction relative to the longitudinal axis; an abutment region, which is configured for abutment against the tool holder, in particular directly adjoining the head region; a shank region which is in particular directly adjacent to the abutment region; and in particular a clamping area directly adjoining the shank area.

In the clamping region, the milling tool has at least one clamping wedge with a tool holder contact surface and/or two legs which are spaced apart from one another in the radial direction relative to the longitudinal axis of the milling tool by a clamping gap, or the milling tool has a sliding bevel against which a clamping mechanism, in particular a clamping screw, contacts, and/or the milling tool has a guide recess into which the clamping screw engages. In this case, it is important for the clamping wedge of the milling tool to be provided in particular for the direct abutment against the tool holder, in particular against the interior thereof. It is important for the clamping gap that it is in particular possible for the two legs to be bent away from one another and thus to cause the milling tool to be fixed in the tool holder. It is particularly advantageous for the sliding ramps and/or the guide recesses in the clamping region of the milling cutter to interact with the clamping mechanism, in particular when the clamping mechanism is screwed down, to cause a pulling force on the milling cutter in the direction of its insertion into the tool holder or in this direction. Additional details of this are set forth in more detail below.

A further component of the tool holder system according to the invention is a tool holder which is designed for the direct accommodation of the milling tool in such a way that the milling tool is mounted in the tool holder in a detachable and exchangeable manner or in the mounted state. The tool carrier can be fastened directly to the carrier tube of the milling roller or indirectly in the form of a so-called replacement bracket, which in turn can be supported on the base part in a replaceable manner. The tool holder is basically configured as a holding sleeve and comprises an end-side milling tool receiving opening, a shank receiving cavity adjoining the milling tool receiving opening in the direction of the insertion axis of the milling tool and extending into the interior of the holding sleeve, and a clamping means opening extending transversely to the insertion axis of the shank receiving portion, which clamping means opening provides an access connection from the outside of the holding sleeve surrounding said insertion axis up to the shank receiving cavity, and through which clamping means opening a clamping mechanism can be inserted for fixing the milling tool in the tool holder.

Details and various preferred refinements relating in particular to the tool holder system according to the invention and in particular also to the milling tool and the tool holder will be described in more detail below.

A nose refers to a pointed, constricted tip region or head region of the milling tool which, during the milling process, impinges on the ground substrate to be milled. Preferably, the tip is made of a hard metal or in particular in a manner comprising PCD material. The nose may be part of a shroud element or a cap, such as a wear protection cap, or may be fastened to the cap, such as by brazing or the like. Internally, the cutting insert may have in part a part of a tool base body, which is made of steel, in particular hardened and tempered steel. The cutting insert with the cutting tip is generally configured to widen along the longitudinal axis of the milling cutter away from the cutting tip or against the cutting direction in a radial direction relative to the longitudinal axis. The cutter head may thus for example have a substantially conical overall structure.

In the longitudinal direction away from the nose, the contact area of the milling tool, which is configured to contact the tool holder, is connected in particular directly to the head area described above. The contact area of the milling tool is thus arranged in the installed state, i.e. when the milling tool is in the tool holder, in particular directly against the tool holder and in this area forces introduced into the tool tip of the milling tool are introduced into the tool holder, for example as a result of a continuous milling process, and ultimately into the milling drum via the tool holder. The contact area is preferably formed by the tool base body. The contact area of the milling tool can extend, for example, in a radial direction relative to the insertion axis of the milling tool and/or its longitudinal axis, as far as the radial edge of the tool holder and/or even overlap the radial edge.

The shank region is connected in particular directly to the contact region, away from the nose in the direction of the longitudinal axis of the milling tool. The milling tool can be embodied in the region of the shank in a longitudinally extending manner, for example in the form of a cylinder. The task of the shank region is to connect the contact region with a clamping region, which is described in more detail below. The shank region is also preferably formed by the tool base of the milling tool. Furthermore, the shank region may be larger or smaller relative to its extension in the direction of the longitudinal axis of the milling tool. The shank region may even be configured at least partially overlapping the abutment region.

The clamping area follows the shank area in particular directly along the longitudinal axis of the milling tool in a direction away from the tip, wherein, according to the invention, the milling tool has, for example, at least one clamping wedge with a tool-holder contact surface in the clamping area. In addition or alternatively, the milling tool has in the clamping region, in particular just or only two shank limbs, which are spaced apart from one another in the radial direction relative to the longitudinal axis of the milling tool by a clamping gap, or the milling tool has a sliding bevel against which a clamping mechanism, in particular a clamping screw, rests and/or the milling tool has a guide recess into which the clamping screw engages. The clamping region thus has the main function of fixing the milling tool in the tool holder in a rotationally fixed manner and at the same time also for its axial fixing, in particular also in conjunction with the clamping mechanism. The clamping region is configured such that the milling tool can be clamped in the tool holder in a rotationally fixed manner by means of the clamping region.

In this case, it is important for the design variant of the milling tool according to the invention that a clamping wedge having a tool-holder contact surface is provided in the clamping region. The clamping wedge is characterized in that the clamping wedge comprises an abutment surface extending outwards in a radial direction, obliquely to the longitudinal axis, wherein the abutment surface forms the outer surface of the wedge. The abutment surface is thus configured such that it increases in the radial direction away from the nose in the direction of the longitudinal axis of the milling tool, i.e. rearward with respect to the working direction of the milling tool. The abutment surface thus forms a contact surface which descends forward in the direction of the longitudinal axis towards the nose, which contact surface is provided for fixedly abutment against a tool holder, which will be described in more detail below.

In addition or as an alternative to the clamping wedge, the milling cutter may also have at least one sliding chamfer and/or a guide recess in the clamping region, in particular in the region of the milling cutter shank and more particularly in the region of the shank leg. The sliding chamfer and/or the guide recess may be constructed and arranged for at least partial engagement with a clamping means which can be introduced into the tool holder, in particular from outside the tool holder. The task of the sliding chamfer and/or the guide recess is, in particular, to apply a clamping force, in particular a tensile force in the insertion direction of the milling tool into the tool holder, to the clamping region in conjunction with the clamping means. The clamping means, together with the sliding ramp and/or the guide recess, form a type of wedge-shaped drive in which the insertion or application direction of the clamping means, which extends ideally approximately perpendicularly to the insertion direction of the milling tool, is converted into a pulling-in movement of the milling tool into the tool holder in the direction of its insertion axis by means of the wedge-shaped sliding surface.

The sliding ramp is therefore distinguished, inter alia, by the sliding ramp extending in the milling tool at an angle or at an angle to the insertion axis of the milling tool, i.e. intersecting the insertion axis, and by the clamping means sliding along the sliding ramp during clamping, in particular in a direction substantially perpendicular to the insertion direction of the milling tool into the tool holder. The guide recess is characterized in particular by the fact that it is a recess in the shank, in particular in the form of a through-hole in the shank which is solid in the rest and preferably essentially cylindrical in shape and extends perpendicular to the insertion axis or longitudinal axis of the milling tool. It is particularly preferred that the sliding chamfer of the milling tool is formed by the guide recess itself. For this purpose, it can be provided in particular that the guide recess has a hollow conical inner circumferential surface, wherein the longitudinal axis of the cone runs perpendicular to the longitudinal axis of the milling tool.

As a whole, the milling cutter may be composed of a plurality of individual components during the production process and, for example, as a supplement to the PCD tips (boron nitride may alternatively be used), have a wear protection cap or cap, in particular composed of a hard metal, more in particular having a vickers hardness in the range 1100-1600HV, and a cutter base, in particular composed of hardened and tempered steel, forming part of the cutter head, the abutment region, the shank region and the clamping region. The preferred components of the cartridge are tungsten carbide and/or cobalt. It is important that the individual components forming the milling tool whole are fixedly and non-detachably connected to each other, for example by soldering, welding and/or adhesive bonding, and in this way form a fixedly associated component whole which in its entirety forms the milling tool.

Preferably, the clamping wedge has a greater radial extent with respect to the longitudinal axis of the milling tool than the shank region adjoining the clamping wedge. In this embodiment, the clamping wedge thus protrudes beyond the shank region in the radial direction. In this way, it is achieved that the milling tool can rest against the tool holder in a particularly load-bearing manner, as will be described in more detail below.

In principle, the specific design of the contact area can vary. Advantageously, the contact region has at least in part a contact cone tapering in the radial direction in the direction away from the tip, wherein the contact cone is in particular configured as a truncated cone. Thus, in this embodiment, the abutment region becomes smaller in its diameter rearwardly away from the nose. A relatively large contact surface for the milling tool against the tool carrier is thus obtained, which contact surface overall enables an optimized force transmission between the milling tool and the tool carrier. In this case, it is desirable for the abutment cone to have at least in part a straight generatrix which is oriented obliquely in the direction of the longitudinal axis of the milling cutter (the generatrix here representing the course of the outer circumference in a plane in which the cone axis of the abutment cone also extends), wherein, in addition or alternatively, for example, curved and/or stepped variants can also be included together. The straight part of the generatrix, in particular the straight part of the abutment cone, which is preferably embodied completely as a cone with a straight generatrix, preferably intersects the longitudinal axis of the milling tool in the case of a virtual extension in an angular range of more than 5 °, in particular more than 10 °, and less than 50 °, in particular less than 30 °.

The at least one clamping wedge of the milling tool is preferably arranged at the end in the longitudinal direction of the milling tool. The clamping wedge thus preferably forms the end or at least one end region of the milling cutter in a direction away from the nose. This makes possible a relatively compact design of the milling tool with simultaneously optimized clamping options, which will be explained further below. In addition to the abutment surface or wedge surface formed by the clamping wedge for abutment against the tool holder, the clamping wedge in the present invention also comprises a portion of the milling tool which, in the radial direction, extends beyond the shank region, behind the tool holder abutment surface in the direction away from the tool nose.

It is therefore desirable for the at least one clamping wedge to comprise an abutment surface extending obliquely to the longitudinal axis of the milling tool, wherein the distance of the abutment surface in the radial direction relative to the longitudinal axis of the milling tool increases in the direction away from the nose. The abutment surface thus extends opposite the abutment cone. The milling tool is thus tapered with respect to its longitudinal axis in the region of the abutment or in the region of the abutment cone, as seen from the nose, and then widens again at least partially in the region of the clamping wedge. The contact surface of the clamping wedge preferably extends here at an angle of 20 ° to 70 °, in particular 35 ° to 55 °, relative to the longitudinal axis of the milling tool. Independently of this, the contact surface of the clamping wedge preferably extends steeper relative to the longitudinal axis of the milling tool than the contact surface which may be present in the contact region and extends obliquely. As will be described in more detail below, the abutment surface of the clamping wedge can be used to screw the milling tool inside the tool holder.

In particular, the milling tool preferably comprises only two clamping wedges which are positioned opposite one another in the radial direction. In this embodiment, the two clamping wedges are arranged separately from one another and spaced apart from one another in a radial direction relative to the longitudinal axis of the milling tool. The use of a plurality of clamping wedges, in particular precisely two clamping wedges, is advantageous because the milling tool can be clamped simultaneously by means of a plurality of abutment surfaces which face one another in a radial direction relative to the longitudinal axis of the milling tool, so that the total clamping force can be generated at a plurality of points distributed around the longitudinal axis of the milling tool and thus distributed around the longitudinal axis.

In principle, clamping wedges of different types of construction can be realized on milling tools. However, it is advantageous in particular in terms of the production and installation process that the two clamping wedges are formed mirror-symmetrically to one another with respect to a mirror plane extending in the direction of the longitudinal axis of the milling tool.

An important aspect of such a milling tool according to the invention is that the milling tool can be fixed in the tool holder by means of the at least one clamping wedge, in particular can be clamped directly with the tool holder. This is particularly well achieved if the milling tool has two shank legs in the clamping region, as will be described in more detail below.

Additionally or alternatively, a further independent solution of the invention, in particular also as part of the blade carrier system according to the invention, relates to a milling tool for a floor milling machine, comprising: a cutting insert having a cutting tip, wherein the cutting insert widens in a head region counter to the cutting direction or away from the cutting tip along a longitudinal axis of the milling tool in a radial direction relative to the longitudinal axis; an abutment region, in particular a conical abutment region, which adjoins the head region in particular directly and is designed for abutment against the tool holder; a shank region which is in particular directly adjacent to the abutment region; and a clamping region which is in particular directly adjacent to and/or is at least partially formed by the shank region, wherein the milling tool has, for example, at least two shank legs in the clamping region, which shank legs are spaced apart from one another in a radial direction relative to the longitudinal axis of the milling tool by a clamping gap. For this variant, the use of clamping wedges on the shank is not mandatory. In addition or alternatively, the screwing force of the clamping screw is converted into a tensile force acting on the milling tool when the clamping screw is screwed in via the contact surfaces between the clamping screw and the tool, in particular the tool shank, which contact surfaces extend in a wedge-like manner with respect to one another, by means of the tapered through-hole and/or the tapered clamping screw, that is to say by means of the sliding chamfer and/or the guide recess described above in or on the tool shank. For this purpose, a shank can optionally be used in addition. In this solution, the tool shank thus has no radial enlargement in the form of a clamping wedge towards its tool end.

Irrespective of the use of the clamping wedge, the use of two legs spaced apart from one another in the radial direction relative to the longitudinal axis of the milling tool (the legs being spaced apart from one another in the radial direction relative to the longitudinal axis of the milling tool by the clamping gap) results in the possibility that the legs open up from one another for fastening in the tool holder and are thereby clamped in the tool holder, in particular by friction fit. In this way, the milling tool is no longer of solid construction in the clamping region, but rather comprises two legs spaced apart from one another, which are radially spaced apart from one another by a recess configured as a clamping gap relative to the longitudinal axis of the milling tool. This particular embodiment enables, in particular, the two legs to be moved, in particular bent, relative to one another, and in this way a particularly good fastening of the milling tool in the tool holder is achieved. The material recess obtained by the clamping gap makes the milling tool less firmly formed in this region. The clamping gap is therefore preferably also configured to open away from the rear side of the nose in the direction of the longitudinal axis of the milling tool. The clamping gap thus preferably extends generally at least in the clamping region up to the rear side of the milling cutter and completely through the milling cutter in the radial direction relative to the longitudinal axis of the milling cutter on at least two sides opposite one another. In this region, the two legs are therefore preferably free of contact with one another, which facilitates the bending process for clamping purposes, for example, such that the two legs are bent away from one another in a radial direction relative to the longitudinal axis of the milling tool. This may be combined with a sliding ramp and/or a guiding recess.

Preferably, the shank and the clamping gap extend into the shank region of the milling tool, in particular into the contact region of more particularly conical design.

The sizing of the head region, abutment region, stem region and clamping region may vary. However, with respect to the radial extension of the individual regions relative to the longitudinal axis of the milling tool, it is preferred that the head region has the greatest radial extension of the milling tool. There are also a large number of variants regarding the axial extension of the individual regions along the longitudinal axis of the milling tool. In principle, however, it is advantageous if the axial extension of the contact region is greater than the axial extension of the clamping region. The ratio of the axial length of the abutment region to the axial length of the clamping region is particularly preferably greater than 2:1 and very particularly greater than 3:1, in particular greater than 4:1.

The splaying or bending of the at least two legs relative to each other may be achieved in different ways and methods. A preferred variant consists in using clamping means for this purpose, which can be adjusted individually with respect to the milling tool and individually with respect to the tool holder. For this purpose, in particular, clamping screws can be used, the function of which is essentially to cause bending of the at least two legs relative to one another by a screwing movement. In a preferred embodiment, this is achieved in that the two legs have a receiving section which overlaps the clamping gap and is essentially hollow-cylindrical or hollow-cylindrical shell-shaped and/or hollow-conical shell-shaped, in particular comprising a thread. The receiving section is configured to at least partially receive a clamping screw. In particular, if the receiving section has a thread or is designed as a threaded section, the clamping screw can engage in a form-fitting manner in the thread in such a way that, when the screwing-in movement is continued, the two mutually opposite legs are respectively bent outwards relative to one another in a radial direction relative to the longitudinal axis of the milling tool or are at least partially splayed relative to one another relative to the longitudinal axis of the milling tool. This movement can be used to fix the milling tool in the tool holder in a manner which will be described in more detail below.

The optionally present thread is essentially used for guiding the clamping screw or for a positive engagement thereof, for which purpose, additionally or alternatively, at least one of the two legs and in particular the two legs can have a guide recess, in particular in the form of a hollow cone shell, which is designed to guide the clamping screw in order to at least partially adjust, in particular open, the two legs relative to one another. The guide recess serves in the core for guiding the clamping screw in a defined manner in order to open the two legs and thus in particular ensures a defined force transmission between the clamping screw and the milling tool.

The guide recess is preferably formed here as a smooth-walled, in particular hollow-cone-shaped expansion section, which adjoins the substantially hollow-cylindrical and/or hollow-cone-shaped thread section in the screwing-in direction of the clamping screw.

It is desirable if there is an unloading hole which is positioned in the clamping gap at the end or adjoins it without transition, so that the distance of the two legs increases and subsequently decreases partially in the region of the unloading hole with respect to the adjoining clamping gap, and so that the two legs are connected to one another by a connecting region which adjoins directly to the unloading hole. The relief opening thus means a through opening in a radial direction relative to the longitudinal axis of the milling tool, in particular directly adjacent to the clamping gap or directly transitioning into the clamping gap. By means of the relief hole, a transitional expansion of the clamping gap towards the milling cutter part connecting the two shanks is thus obtained. Thus, the unloader hole causes a transitional material taper relative to the region adjacent to the unloader hole. Thus, by means of the relief holes, material stresses in this region can be reduced when the two shanks are bent relative to one another, whereby for example undesired fractures can be prevented.

It can thus be provided that the milling tool for a floor milling machine comprises a cutting tip, in particular of PCD material, a substantially conical cutting cap, in particular of hard metal, having a tip region, in which the cutting tip is connected to the cutting cap, and a tool base, which is connected to the cutting cap on the side opposite the tip region or the head region. It may be preferred here that the knife cap has an at least partially conical abutment surface. The tool base body further has a receiving surface which is complementary to the at least partially conical abutment surface, the receiving surface abutting the abutment surface. The cap is thus directly attached to the base body. Finally, the tool cap and the tool base body enclose a cavity according to the invention, wherein the cavity is configured such that it extends past at least 10%, in particular at least 20% and in particular at least 25% of the extension of the tool cap in the direction of the longitudinal axis of the milling tool. Preferably, the extension of the cavity extends in the direction of the longitudinal axis of the milling tool, even over at least 50% of the extension of the tool cap. It is therefore provided that a significant cavity is present in the interior of the milling tool. By means of this cavity, a significant saving in material is also achieved, since in particular the tool cap no longer has to be formed continuously from one side to the opposite side, but rather is provided at least in sections with wall regions which surround the cavity radially, in particular with respect to the longitudinal axis of the milling tool, and which adjoin the cavity lying inside towards the outside environment.

Preferably, the milling tool is designed such that the abutment surface of the cap is completely conical, in particular with a continuous and smooth outer circumferential surface. In this way, the blade cap can be fastened to the base body without special positioning with respect to its axial rotational position relative to the base body, which eases the installation. In addition or alternatively, it may be provided that the abutment surface is configured to surround, in particular completely surround, the longitudinal axis of the milling tool. This also makes it easy to mount the blade cap on the base body. Further additionally or alternatively, it is preferred that the abutment surface of the at least partially conical configuration of the cap tapers in a direction away from the tip and in a direction towards the shank. The abutment cone formed by the cap thus extends in a direction away from the nose towards the longitudinal axis of the milling tool. In addition or alternatively, it is also preferred that the cavity protrudes in the longitudinal direction of the milling tool away from the tool base body in the direction of the tip beyond the abutment surface and the receiving surface. The cavity thus extends from the base body in the direction of the tip beyond the abutment surface and the receiving surface, whereby a particularly wide range of material savings is possible without adversely affecting the stability of the abutment region between the cap and the base body.

Preferably, the wall thickness of the tool cap is substantially constant over the axial height of the cavity (except for the contact region) or varies within +/-10% of the average wall thickness, wherein the average wall thickness is the wall thickness in the cavity region (except for the contact region) in the radial direction relative to the longitudinal axis of the milling tool.

When using milling tools, the tips typically lift the chip from a firm ground substrate. The chips then slide down the milling cutter. This movement not only wears the tip of the milling tool, but also the entire head region of the milling tool. It is now preferred that the tool base body is configured radially without projection relative to the tool cap relative to the longitudinal direction of the milling tool. This means that the maximum extension of the base body in the radial direction with respect to the longitudinal axis of the milling cutter is exactly as great as the maximum extension of the blade cap in the radial direction with respect to the longitudinal axis of the milling cutter. Thus, the cap completely shields the tool base from the tip. The tool cap is preferably made of a material which is more resistant to wear relative to the tool base, in such a way that wear of the tool base and in particular at least part of the region of attachment or contact of the tool base to the tool cap is achieved by the tool cap.

The cavity or its extension is of great importance. With regard to the extension of the cavity in the radial direction relative to the longitudinal axis of the milling tool, it is particularly advantageous if the maximum extension of the cavity in the radial direction is greater than 20%, in particular greater than 30% and very particularly greater than 50% of the maximum radial distance of the outer circumferential surface of the tool cap relative to the longitudinal axis. Additionally or alternatively, the maximum extent of the cavity in the radial direction is less than 90%, in particular less than 80%, of the maximum radial distance of the outer circumferential surface of the tool cap relative to the longitudinal axis. These dimensional ratios have proven to be optimal for commonly used cutter sizes. In addition or alternatively, it is advantageous if the cavity extends in the radial direction beyond the abutment cone of the tool shank for abutment against the tool holder and/or the entire tool shank. In this way, particularly high material savings are achieved, while the milling tool has high bearing stability. It may also be advantageous if the extension of the cavity in the radial direction with respect to the longitudinal axis of the milling cutter is greater than the extension of the nose in the radial direction with respect to the longitudinal axis and/or greater than the wall thickness of the cap at the same axial height of the longitudinal axis of the milling cutter.

A further preferred variant of the milling tool according to the invention consists in the axial longitudinal extension of the cavity in the direction of the longitudinal axis of the milling tool. In this respect, it is advantageous if the ratio of the maximum axial extent of the cavity in the direction of the longitudinal axis of the milling cutter to the maximum radial extent of the cavity relative to the longitudinal axis is in the range from 1.5:1 to 1:1.5, in particular from 1.4:1 to 1:1.4. Additionally or alternatively, the axial longitudinal extent of the cavity in the direction of the longitudinal axis of the milling cutter is smaller than the axial distance from the lower edge of the blade cap in the longitudinal direction of the milling cutter to the inner wall of the blade cap intersecting the longitudinal axis. It may also be advantageous if the ratio of the maximum axial longitudinal extent of the cavity in the direction of the longitudinal axis of the milling cutter to the maximum axial longitudinal extent of the entire body of nose and cap in the direction of the longitudinal axis of the milling cutter is in the range from 1:1.5 to 1:7, preferably from 1:1.7 to 1:2, and/or the maximum extent of the cavity in the direction of the longitudinal axis of the milling cutter is greater than 1/9 and in particular greater than 1/5 of the maximum extent of the milling cutter in the direction of the longitudinal axis of the milling cutter. By means of these preferred refinements, the cavity configuration can be optimized in the longitudinal direction with respect to material saving and component stability.

Preferably, the milling tool is designed such that the closed cavity has a volume fraction of at least 15%, in particular of at least 25% and more particularly of at least 30% of the volume of the space occupied by the cavity and the tool cap, and/or the cavity has a volume fraction of at least 5%, in particular of at least 10% of the total volume of the milling tool, and/or has a volume fraction of at most 30%, in particular of at most 25%, of the total volume of the milling tool. Additionally or alternatively, the volume of the enclosed cavity is preferably greater than the volume of the nose body constituting the nose. These volume ratios are also the best ranges in terms of stability and material savings.

In particular, it is also advantageous for the hollow space to be formed in a conical section and/or to have smooth walls, in particular to comprise conical surfaces of identical shape and/or at least one circular base surface, in particular two circular surfaces lying opposite one another. Such a cavity can be manufactured relatively simply in terms of manufacturing technology. Additionally or alternatively, the cavity is configured such that the cavity has an inner wall (in particular in the form of a circular disk) extending substantially perpendicularly to the longitudinal axis of the milling tool and/or comprises an inner wall intersecting the longitudinal axis, which inner wall makes an angle of 100 ° to 140 °, in particular 105 ° to 120 °, with a side wall which does not intersect the longitudinal axis, in particular surrounding the longitudinal axis.

In order to optimally configure the relative positioning and force output between the insert cap and the insert base, the angle of taper of the abutment surface relative to the longitudinal axis is preferably in the range of 25 ° to 75 °, in particular 35 ° to 65 °, and very particularly in the range of 45 ° to 55 °, in the direction of the insert tip in a virtual plane along the longitudinal axis. Thus, the taper formed tapers towards the longitudinal axis, preferably in a direction away from the tip. In a preferred angular range, an optimal force transmission from the tool cap to the tool base body and at the same time a loadable positioning of the tool cap on the tool base body are achieved.

It can be provided that a circumferential annular groove is provided in the tool base body, in particular in the radial direction, upstream of the contact region or inside the contact region. It is furthermore preferred that the annular edge of the cap engages in the annular groove in the longitudinal direction of the milling tool. This aspect also simplifies the assembly and optimizes the precise orientation of the tool cap and the tool base relative to each other. On the other hand, in this region, solder can be introduced for fastening purposes.

The conical configuration of the abutment region between the tool cap and the tool base provides a number of advantages, in particular, the fastening of the tool cap to the tool base, preferably by means of a soldered connection on the tool base mounted in this region. Challenges exist in terms of the manner of fastening, especially when the tool base is made of conventional steel and the tool cap is preferably made of hard metal. Common cemented carbide materials typically have a coefficient of thermal expansion that is about only half that of steel materials typically used in milling tools. This can lead to high shear stresses between the tool cap and the tool base, especially when a brazed connection is used. However, these shearing stresses can be significantly reduced if the contact area is now not formed perpendicular to the longitudinal axis of the milling tool, but is inclined in the contact area by a taper with respect to the longitudinal axis, so that an angle of significantly less than 90 ° is obtained. Furthermore, the soldering points are subjected to pressure due to the direction of the forces oscillating during milling, which in the end effect enables a significantly higher force to be transmitted from the tool cap to the tool base.

Further aspects of the invention relate to a tool holder, in particular for use with a milling tool according to the invention in a tool holder system according to the invention. A possible feature of the tool holder according to the invention may be that a side recess is provided in the tool holder, i.e. in its interior, which side recess is provided for direct abutment against a milling tool, in particular a clamping wedge of a milling tool according to the invention as described above.

According to the invention, the tool holder is preferably essentially designed as a holding sleeve (having an end-side milling tool receiving opening), a shank receiving cavity which adjoins the milling tool receiving opening in the direction of the milling tool insertion axis and extends into the interior of the holding sleeve, and a clamping element opening which extends transversely to the insertion axis of the shank receiving portion and which provides an access connection to the shank receiving portion and/or to the clamping wedge receiving cavity, which is separate and positionally separate from the milling tool receiving opening, from the outside of the holding sleeve around the insertion axis to the interior of the tool holder. Furthermore, the inner cavity of the tool holder, in particular the milling tool receiving opening in the shank receiving space, can also comprise a cone abutment space which is at least partially funnel-shaped or hollow cone-shaped and has a cross section tapering in the insertion direction. The milling cutter is pushed into the tool holder through the milling cutter receiving opening in the pushing direction. This is typically done along a linear axis, referred to herein as the push-in axis. Alternatively, the insertion axis may also be defined by the longitudinal axis of the tool holder and/or by the longitudinal axis of a milling tool inserted into the tool holder. According to the invention, a shank receiving space is provided behind the milling cutter receiving opening in the insertion direction. The shank receiving chamber extends longitudinally along the insertion axis and serves to receive the shank inside the tool holder when the milling tool is installed. Access to the clamping area of the milling tool from outside the tool holder system transversely to the insertion axis of the shank holder is achieved by means of the clamping means opening, for example for tensioning and releasing the clamping means and/or for penetrating the clamping means. Since the clamping device opening extends transversely to the insertion axis, the presently preferably closed rear side of the tool holder does not have to be used, for example, in order to loosen and tighten the milling tool in the tool holder, but rather this can be achieved by the lateral effect, so that, for example, a relatively narrow arrangement of a plurality of tool holders can be achieved.

The tool holder may have a clamping wedge receiving cavity adjoining the shank receiving cavity in the direction of the insertion axis, which is configured for receiving at least one clamping wedge, wherein the clamping wedge receiving cavity has at least one partial region which widens in the radial direction relative to the shank receiving cavity adjoining counter to the insertion direction and is thus partially undercut. The partial region has an abutment surface which is preferably embodied complementarily to an abutment surface of a clamping wedge of the inserted milling tool and which can be used to clamp the milling tool in the tool holder. The clamping wedge receiving space is configured at least partially to be further enlarged outwardly relative to the shank receiving space in a radial direction relative to the insertion axis, so that a cavity is generally obtained which is at least partially undercut relative to the shank receiving space and can be used to form-fittingly abut the clamping wedge of the milling tool when the milling tool is inserted. The abutment surface in the clamping wedge receiving space of the tool holder preferably extends at an angle to the insertion axis in such a way that the radial distance of the abutment surface from the insertion axis increases in a direction away from the milling tool receiving opening or rearward. The abutment surface, which is radially spaced from the insertion axis, is thus configured to be inclined in the insertion direction or rearward.

Preferably, a clamping means, in particular a clamping screw, is used for clamping the milling tool, in particular the milling tool according to the invention, in the tool holder. In order to enable such a clamping screw to act directly on a milling tool located in the tool holder, according to the invention a clamping means opening is provided which connects the outside of the tool holder with the inner cavity of the tool holder, in particular the shank receiving cavity and/or the clamping wedge receiving cavity. In this way, the clamping means can be inserted from outside the tool holder, for example, by screwing in a clamping screw, which in particular protrudes with its tip region into the shank receiving space and/or into the clamping wedge receiving space, and contacts there a partial region of the milling tool located in the tool holder, and is fixed, for example, by expansion of the shank and/or slides along a sliding bevel and/or engages in a guide recess, in order to strike the pull-in force on the milling tool in the tool holder, for example, by means of the wedge-shaped drive described above.

Preferably, the clamping means opening in the tool holder has an internal thread for engaging a corresponding external thread of the clamping means, in particular of the clamping screw. In this way, on the one hand, no screw thread is required in the clamping region of the milling tool to generate the aforementioned pull-in force. On the other hand, the tool holder sleeve is generally constructed relatively strong, so that there is sufficient material thickness for providing an internal thread of sufficient size.

It is now preferred that the tool holder has a sleeve base with a bottom wall which, in the insertion direction, closes off the interior space present in the interior of the tool holder, in particular completely, on the side opposite the milling tool opening. The end face of the tool holder opposite the milling tool receiving opening is thus closed, so that dirt and/or water cannot penetrate from the rear face into the interior of the tool holder during operation. This variant can be designed in such a way that the tool holder, as a connection opening to the environment outside the tool holder, preferably has only an end-side milling tool receiving opening and a clamping element opening extending transversely to the shank insertion axis. In the installed state, a completely closed tool holder interior is thus obtained with respect to the outside environment, wherein the clamping screw and/or the milling tool with the protective cap has a sealing means, for example a sealing ring, in the contact area for improved sealing. By means of such a preferred tool holder, the interior space of the tool holder can be completely closed with respect to the outside environment, and thus water and/or dirt can be prevented from penetrating into the contact area between the milling tool and the tool holder. This effectively counteracts corrosion phenomena and/or other adverse effects occurring in this area due to water and/or dirt.

Preferably, the clamping device opening is essentially configured as a hollow cylinder. Furthermore, it is additionally or alternatively advantageous if the clamping means opening has a thread, in particular an internal thread.

Advantageously, the tool holder has a hollow conical abutment region or abutment chamber between the milling tool receiving opening and the shank receiving chamber, the radial distance of which relative to the insertion axis decreases at least partially in the insertion direction away from the milling tool receiving opening. This makes possible the use of milling tools having a conical contact area which has an improved force output between the milling tool and the tool holder and furthermore makes it easier to pre-position the milling tool inside the tool holder during installation of the milling tool in the tool holder.

In addition or alternatively, it is also preferable if the clamping wedge receiving space is at least partially likewise formed as a hollow cone or in particular comprises two hollow cone shells arranged opposite one another. The two hollow cone shells are preferably spaced apart from one another in the radial direction relative to the insertion axis via the insertion slot and are configured in a tapering manner in the radial direction relative to the insertion slot in the direction toward the milling tool receiving opening, as a result of which an undercut partial region is obtained. The clamping wedge receiving space is at least partially formed as a hollow cone or as a hollow cone shell region, and provides an optimized engagement surface for abutment against a clamping wedge of a milling tool placed in the tool holder.

The tool holder according to the invention can be provided for direct fastening to the milling tube or for receiving by means of a base piece connecting the tool holder to the milling tube. In the latter case, the tool holder is then configured as a cartridge changer.

In the case of the tool holder system according to the invention, it can be provided that the milling tool, with its at least one clamping wedge inserted into the tool holder, is held directly and in particular force-loaded against the clamping wedge receiving space of the tool holder by means of a clamping mechanism or a clamping screw for the purpose of rotationally fixing the milling tool relative to the tool holder. For example, tightening the clamping screw in this case particularly preferably results in the two legs of the milling tool being spread apart, as described above. By this relative adjustment of the two legs relative to one another, the legs according to the invention achieve a direct abutment with the inner surface of the clamping wedge receiving chamber or with the corresponding abutment surface present there, which is at least partially complementary to the abutment surface formation of the at least one clamping wedge, so that the milling tool is ultimately fixed directly in the interior of the tool holder relative to the tool holder. The contact area of the clamping wedge in the clamping wedge receiving space extends here obliquely to the insertion axis of the tool holder or obliquely to the longitudinal axis of the milling tool, in particular preferably in such a way that the contact surface of the clamping wedge is at an angle of less than 90 °, in particular less than 70 °, to the insertion axis of the tool holder or the longitudinal axis of the milling tool from the tool nose. Yet further preferably, the angle is greater than 20 ° and especially greater than 30 °. In this way, a type of wedge-shaped push transmission is thus obtained between the clamping screw, the clamping wedge and the clamping wedge receiving chamber. The opening of the two legs then produces a resultant adjusting and holding force on the milling tool in the direction of insertion of the milling tool or in the direction of the longitudinal axis of the milling tool in the interior of the tool holder. Tightening of the clamping screw thus results in the milling cutter being pulled into the tool holder or away from the nose in the direction of the longitudinal axis of the milling cutter. The screwing force applied by the clamping means or in particular by the clamping screw is converted into a tensile force acting on the milling tool in the direction of insertion, with which the milling tool is pulled in particular also with its abutment cone towards the cone abutment cavity in the interior of the tool holder. By using the aforementioned wedge surfaces or contact surfaces extending obliquely to the insertion axis between the milling tool and the tool holder, this deflection of the screwing forces acting on the clamping means toward the pulling forces acting on the milling tool is achieved.

Even though the specific design and in particular the specific angle may vary, in principle, an angular range is preferred. The abutment surface of the abutment cone of the milling cutter and the abutment surface of the cone abutment cavity of the tool holder preferably have a generatrix which extends complementarily with respect to the longitudinal axis and/or the insertion axis and which, in a virtual extension, preferably intersects the longitudinal axis of the milling cutter and/or the insertion axis of the tool holder in an angular range of more than 5 °, in particular more than 10 ° and less than 50 °, very particularly less than 30 °, measured in the direction of the tool tip. The contact surfaces of the clamping wedge of the milling tool and of the clamping wedge receiving space of the tool holder preferably have generatrix extending complementarily relative to the insertion axis and/or longitudinal axis, which, in a virtual extension, preferably intersects the insertion axis of the milling tool and/or of the tool holder in an angular range of less than 75 °, in particular less than 60 °, and/or more than 20 °, and in particular more than 30 °, measured in a direction away from the tool tip. Furthermore, the two bus bars are preferably at an angle of 50 ° to 130 °, in particular 60 ° to 120 °, to each other.

The tool holder system may also be configured as a retrofit bracket system. An additional base member is then provided, which is configured to support the tool holder. Furthermore, the base part is provided for fastening to the milling tube.

Irrespective of the embodiments described above, a further aspect of the invention relates to a milling cutter and a milling cutter rotary tool, in particular as described above. The milling cutter rotary tool is provided for rotating the milling cutter in the tool holder about its longitudinal axis and/or the push-in axis, in particular when it is inserted into the tool holder. According to the invention, it is now provided that the milling tool has a tool engagement in its head region, in particular in its outer circumferential region. The tool insert is configured such that it has a projection and/or recess extending radially with respect to the longitudinal axis of the milling tool in a circumferential direction about the longitudinal axis of the milling tool. The tool engagement is thus a region which, seen in the circumferential direction about the longitudinal axis of the milling tool, is closer to or farther from the longitudinal axis of the milling tool in the radial direction than the region adjoining it. For this purpose, the blade cap can be configured, for example, with a groove extending in the direction of the longitudinal axis of the milling tool. Furthermore, according to the invention, the milling cutter rotary tool is designed for at least partially complementary engagement into the tool engagement, so that a positive fit in the circumferential direction around the longitudinal axis of the milling cutter is achieved in the milling cutter rotary tool engaged into the tool engagement. For this purpose, for example, engagement projections and/or recesses can be provided on the milling tool rotary tool for the tool engagement, wherein these engagement projections and/or recesses are preferably arranged eccentrically, in particular point symmetrically, to one another in the case of a plurality of projections and/or recesses. In this case, it is desirable for the milling tool rotary tool to have an engagement sleeve or collar which is configured circumferentially in the radial direction when the milling tool rotary tool is engaged in the tool engagement of the head region of the milling tool.

In particular, the specific design of the milling tool rotary tool can vary widely. For example, it is advantageous if the milling tool rotary tool has a rotary lever, in particular in the form of a handle, which protrudes outwards in the radial direction, in order to achieve a lever drive for easily performing the rotary movement of the milling tool. It is furthermore advantageous if the tool engagement portion has a plurality of tool engagement portions which are spaced apart from one another at the same angular distance. In this way, different mounting positions of the milling cutter on the milling cutter rotating tool are possible, which facilitates the mounting process. It may be advantageous if the number of tool abutments present in the head of the milling tool corresponds to the number of total abutment projections and/or recesses present on the rotary tool of the milling tool.

Further advantageous variants are possible in particular with regard to the design of the tool insert in the head region of the milling tool. In principle, it is advantageous if the tool insert is integrated into the protective cap or knife cap. In addition or alternatively, the tool engagement can be embodied so as to extend longitudinally in the axial direction of the longitudinal axis of the milling tool in order to facilitate the matched precise positioning of the rotary tool of the milling tool over the tip.

Another aspect of the invention relates to a mounting unit with a milling tool and a clamping device according to the invention, in particular with a clamping screw. It is important that the milling tool has a sliding bevel and/or a guide recess, on or in which the clamping means, in particular the clamping screw, is/are engaged and/or abutted. The sliding bevel represents the outer surface of the milling tool, which extends obliquely to the screw axis or rotational axis of the clamping screw, so that a continued screwing movement of the clamping screw along the screw axis generates an adjusting force on the sliding bevel extending obliquely thereto. The guide recess represents a recess in the milling tool, which recess is configured such that it enables a defined relative movement of the clamping screw with respect to the milling tool. The clamping means may in particular be a clamping screw. The clamping screw represents a threaded element, in particular of one-piece construction and/or extending longitudinally, having an external thread, in particular. The external threads extend about a thread axis. The task of the clamping screw is to fix the milling tool in a defined position inside the tool holder, which is described in more detail below, by direct contact of the milling tool. The clamping means and in particular the clamping screw and the milling tool (the latter in particular in the region of the sliding chamfer and/or the guide recess) are configured at least partially complementary to one another for this purpose.

Preferably, the mounting unit is configured such that the clamping screw has a threaded thread with a thread axis, wherein the thread axis and the longitudinal axis of the milling tool extend obliquely to one another or at an angle to one another, in particular perpendicularly. It is thereby ensured that the clamping screw does not move along the screw axis parallel or coaxial to the milling tool longitudinal axis during screwing in and screwing out. This is also achieved in particular in that the clamping screw itself reduces the impact forces introduced into the milling tool during the milling process. Furthermore, it is not absolutely necessary for the clamping screw to be fixed or released in the region of the "rear of the milling tool", which facilitates the assembly and disassembly, in particular in the case of finish-milling rollers with tightly mounted milling rollers, as will also be explained in more detail below.

The clamping screw preferably has a clamping cone on one end side relative to the screw axis or the thread axis and a recess for a positive-locking engagement of the screw tool on the opposite end side. Such form-fitting engagement can be, for example, a slot, a recess with a polygonal cross section, etc., for engagement with a common screwing tool, for example, a slot, a cross slot, a hexagon, etc. The clamping cone is used for directly contacting the milling tool, in particular for opening the two legs of the milling tool to one another when the screwing-in movement is continued. Preferably, the clamping cone therefore always has a smaller diameter relative to the diameter of the screw thread of the clamping screw, and is furthermore configured to taper along the thread axis in a direction away from the screw thread.

Additionally or alternatively, it may be advantageous for the clamping screw to comprise a cylindrical portion adjoining the clamping cone, in which cylindrical portion a recess for a form-fitting engagement of the screwing tool is introduced at the end side, wherein the clamping cone and/or the cylindrical portion has a screwing thread in the form of an external thread.

It is possible that the thread engagement of the clamping screw is realized on the tool holder, not directly on the milling tool. However, it is provided for the preferred embodiment that one or both of the milling tool, in particular the shank, have a clamping thread for engaging the clamping screw, so that, when the clamping screw continues to be screwed in, the radial distance of the two shanks with respect to the longitudinal axis of the cutting head increases at least in part.

Another aspect of the invention relates to a milling roller, in particular a finish milling roller, having at least one tool carrier system according to the invention. The main element of a typical milling roller is a hollow cylindrical carrier tube, inside which a connecting flange for a milling roller drive is arranged in a manner known per se. While on the outer circumferential surface a plurality of knife holder systems and optionally further elements, such as edge protection mechanisms, ejector plates, etc., are arranged. The tool carrier system according to the invention is particularly suitable for use in so-called finish-milling rollers. These rollers mount the tool holder system relatively tightly to the outer peripheral surface, so that in particular the back side of the tool holder is difficult to access. Such finish-milling rollers preferably have a line spacing of less than or equal to 8 mm. A frequent use of such finish-milling rollers is for the removal of street signs and/or for milling of road surfaces at relatively small depths, for example at most 2 cm.

The invention also relates to a floor milling machine, in particular a cold milling machine, having a milling roller according to the invention. Floor milling machines of this type are known from the prior art and are described, for example, in DE102012022879A1, which is incorporated herein by reference. The invention also extends to front, central and rear rotor milling machines.

Finally, the invention also relates to a method for mounting a milling tool in a tool holder. In this context, reference is made below to the embodiments described above in order to avoid repetition of the names and possibly preferred structures of the individual elements of the milling tool, the mounting unit, the tool holder and the tool holder system.

According to the invention, it is now provided that, for installation of the milling tool in the tool holder, the milling tool is first pushed along the insertion axis into the interior of the tool holder up to the insertion end position. The insertion end position is reached when the milling tool cannot be inserted further along the insertion axis or in the direction of the longitudinal axis of the milling tool into the interior of the tool holder. Next, according to the invention, at least one clamping wedge of the milling tool is introduced into a clamping wedge receiving space in the interior of the tool holder up to a pre-clamping position, wherein for this purpose it is provided that the milling tool is rotated, in particular by 90 °, about the insertion axis from the insertion end position. The clamping wedge is thereby screwed into the clamping wedge receiving chamber by means of a movement directed perpendicularly to the insertion direction. This step is of great importance for the method according to the invention, since by this method it is achieved that a part of the milling tool, in particular the clamping wedge, is placed from the milling tool receiving opening of the tool holder into the undercut receiving area of the tool holder in a structurally relatively simple manner. If the clamping wedge is screwed into the clamping wedge receiving chamber, the clamping means, in particular the clamping screw, is introduced into the tool holder in such a way that the clamping means generates a clamping force on the milling tool, so that the milling tool reaches or is pulled into a clamping end position in which the milling tool is pressed with its at least one clamping wedge against the inner wall of the clamping wedge receiving chamber of the tool holder and the milling tool is simultaneously pulled into abutment with the abutment region abutting against the head region into the tool holder or is at least acted upon by a pulling force in this pulling direction.

Preferably, by introducing the clamping means, in particular the clamping screw, into the clamping wedge receiving space, a mutual opening of at least two legs, which are spaced apart from each other in the radial direction by the clamping gap, in this radial direction relative to the longitudinal axis of the milling tool is achieved, or in particular by means of sliding ramps and/or guide recesses, in particular in the tool shank, a pulling force is produced on the milling tool in the direction of insertion of the milling tool into the tool holder. For the construction of the clamping gap and the legs, sliding ramps and/or guide recesses which are spaced apart from one another in the radial direction, see the embodiments described above. Thus, for example, the opening takes place at least approximately perpendicularly to the longitudinal axis of the milling tool.

In addition or alternatively, it is also preferred that the insertion of the clamping means extends along a screw axis which runs obliquely or transversely, in particular perpendicularly, with respect to the insertion axis of the milling tool into the milling tool holder.

Drawings

The invention is explained in more detail below with the aid of an embodiment shown in the drawings. Showing:

fig. 1A: top view of finish milling roller;

fig. 1B: the side view of the finish milling roller of fig. 1A;

Fig. 2A: a top view of the additional milling roller;

fig. 2B: FIG. 2A is a side view of a milling roller;

fig. 3A: an exploded view of the tool holder system;

fig. 3B: FIG. 3A is a side view of a milling cutter;

fig. 3C: a side view of the milling cutter of fig. 3A rotated 90 ° about the longitudinal axis of the milling cutter relative to the side view of fig. 3B;

fig. 3D: the top view of the tip of the milling cutter of fig. 3A;

fig. 4A: FIG. 3A is a cross-sectional view of the tool post system;

fig. 4B: a side view of the milling cutter of fig. 3A rotated 90 ° about the longitudinal axis of the milling cutter relative to the cross-sectional view of fig. 4A;

fig. 5A: FIG. 4A is a cross-sectional view of a milling tool secured in a tool holder;

fig. 5B: FIG. 4B is a cross-sectional view of the milling tool secured in the tool holder;

fig. 6: a flow chart of the method according to the invention;

fig. 7: side view of the ground milling machine;

fig. 8: a partial enlarged view of region 48 of fig. 5A;

fig. 9A: an exploded perspective view of an alternative embodiment of the tool holder system;

fig. 9B: FIG. 9A is a perspective oblique view of the toolholder system with the milling tool secured within the toolholder and showing the installation tool;

fig. 9C: fig. 9A and 9B are longitudinal cross-sectional views of the toolholder system with a milling tool installed in half of the toolholder;

Fig. 9D: a longitudinal cross-sectional view rotated 90 ° about a longitudinal or push axis relative to the longitudinal cross-sectional view of fig. 9C;

fig. 9E: 9A-9D, wherein the milling tool is in a screw-in end position;

fig. 9F: 9A-9E;

fig. 9G: fig. 9E is a sectional view along line III-III, transverse to the longitudinal axis or the insertion axis, with the milling tool in the insertion end position;

fig. 9H: fig. 9E is a sectional view along line III-III, transverse to the longitudinal or insertion axis, with the milling tool in the screwed-in end position;

fig. 10A: a perspective oblique view of an exploded view of a further alternative embodiment of the tool holder system;

fig. 10B: FIG. 10A is a longitudinal cross-sectional view of the toolholder system with the milling cutter in the push-in end position;

fig. 10C: fig. 10B is a longitudinal section view, wherein the clamping means is pulled tight in the tool holder and the milling tool is clamped in the tool holder; the method comprises the steps of,

fig. 11: an alternative embodiment of the milling tool is a longitudinal section along the longitudinal axis.

Detailed Description

Like elements are denoted by like reference numerals in the figures, wherein not every repeated element in the figures is necessarily individually denoted in every figure.

Fig. 1A shows a milling roller 1 in a top view and fig. 1B shows a milling roller in a side view. In the milling operation, the milling roller is rotated about the axis of rotation R, for example driven by a suitable milling roller drive (not shown), on the milling roller 1 suitable drive flanges 5 being provided for connection to the milling roller drive. The main element of the milling roller 1 is a hollow cylindrical carrier tube 3 (also called milling tube), the outer circumference of which is occupied by a plurality of blade carrier systems 2. The blade holder system 2 comprises a blade holder 8 and a milling tool 9, respectively. The tool carrier 8 can be fastened directly to the outer circumferential surface of the carrier tube 3, as shown, or can be positioned and held as a replacement bracket in a base part, not shown, which in turn is directly connected to the carrier tube. Fig. 1A shows a preferred arrangement of the tool carrier systems 2 in such a way that they extend in a wall pointing towards the centre of the milling roller. The side view of fig. 1B shows that the individual tool carrier systems 2 are offset in the circumferential direction about the axis of rotation R and ideally are arranged with play from one another.

Fig. 2A and 2B also show a milling roller 1, wherein in this milling roller 1, on the one hand, the milling width FB, that is to say the extension of the milling roller 1 along the axis of rotation O, is smaller than in the exemplary embodiment according to fig. 1A and 1B. Furthermore, the arrangement of the tool carrier system 2 differs from the previous embodiments in that there is no helical arrangement directed towards the centre of the milling roller 1, but instead there is an arrangement which is continuous in rows over the entire milling roller width FB. However, the side view according to fig. 2B also shows that the individual tips of the tool holder system 2 are arranged with play and offset from one another in the circumferential direction.

Fig. 1A to 2B also show that, in addition to the tool carrier system 2, the milling roller 1 can also have further elements, for example so-called lifters 4 and/or edge protectors 6, on its outer circumference.

The milling roll 1 of fig. 1A to 2B is also a so-called finish milling roll. These finish-milling rollers are distinguished by a relatively high density on the tool carrier system 2 on the outer circumference of the milling tube 3. This results in a small line distance, wherein the distance of two adjacent cutting circles in the axial direction of the rotation axis R is indicated by the line spacing, as shown in more detail in fig. 2A. For this purpose, in fig. 2A, two milling tools 9A and 9B are indicated adjacent to each other in the axial direction of the rotation axis. The tips of these milling tools 9A and 9B, which are not shown in more detail in fig. 2A, respectively, generate cutting circles in a rotary operation about the axis of rotation O. The positions of the two cutting circles in the direction of the axis of rotation are indicated by S1 and S2 in fig. 2A. The distance of the two cutting circles S1 and S2 from each other in the direction of the rotation axis O represents the line spacing L. In the case of finish-milling rollers, this line spacing L is, for example, less than/equal to 8 mm.

Fig. 3A shows an embodiment of the tool holder system 2 in an exploded view. The main components are here a tool holder 8 and a milling tool 9. Furthermore, a clamping means 10 is present, in the present case in the form of a clamping screw 11. Furthermore, the tool holder system 2 may have a sealing ring 12 and/or a sealing cap 13.

The milling tool 9 can be pushed into the tool holder 8, in particular along a push axis E, which, as in the present exemplary embodiment, can correspond to the longitudinal axis R of the milling tool 9. The longitudinal axis a of the milling tool 9 corresponds to its longitudinal extension. The milling cutter 9 can be rotationally symmetrical and/or point symmetrical with respect to the longitudinal axis a. The insertion axis R represents the movement axis along which the milling tool can be inserted straight into the tool holder 8 from the position shown in fig. 3A up to the insertion end position, for example in the region of the installation process when changing the milling tool. For this purpose, the tool holder 8 has a milling tool receiving opening 15, which is present on the end face in the direction of the insertion axis R and to which an inner cavity (in particular comprising a shank receiving cavity and a clamping wedge receiving cavity), which is not shown in fig. 3, is configured in the present exemplary embodiment as a retaining sleeve inside the tool holder 8, adjoins. Whereas the tool holder 8 is preferably closed in the direction of the insertion axis R relative to the milling tool receiving opening 15 and for this purpose can have a sleeve bottom 59, for example.

The clamping device 10 here represents a device by means of which the milling tool 9 can be fixed or clamped directly relative to the tool holder 8. The clamping means 10 can be introduced from the outside into the tool holder 8, in particular in such a way that they directly and indirectly contact the milling tool 9 located in the tool holder 8 or form-fittingly engage with the milling tool. For this purpose, a clamping device opening 14 is provided in the tool holder 8, which clamping device opening can be separated from the milling tool receiving opening 15 to establish a connection between a cavity in the tool holder 8 for receiving a component of the milling tool 9 and the environment outside the tool holder 8. The preferred clamping means 10 may be a clamping screw 11 shown in fig. 3A. However, other clamping means may be used. The clamping means 10, in particular the clamping screw 11, can have a clamping cone 16, in particular, which is configured to taper toward the tip, in particular, toward the end face of the screw-in axis or longitudinal axis B. The clamping cone 16 can in particular be conically formed, in particular with a straight or non-curved conical circumference or with an elliptical paraboloid conical circumference. The clamping means 10 and in particular the clamping screw 11 can also comprise, on the side opposite the tip of the clamping cone 16, a portion which is in particular configured cylindrically and has a recess 17 for a tool engagement. The recess enables a positive engagement of the screwing tool, for example in the form of a hexagon, a cross-slot or the like. A shank 18 can be arranged between the recess 17 and the clamping cone 16 along a screw-in axis or longitudinal axis B of the clamping screw into the tool holder 8 and/or the milling tool 9. The shank can be configured cylindrically or likewise conically. Furthermore, threads, in particular screw threads, can be provided on the outer circumferential surface of the clamping cone 16, the part carrying the recess 17 for the tool engagement and/or the shank 18, which threads are provided, for example, as part of the clamping device opening 14 and/or the milling tool 9, for engagement into suitable mating threads in the manner described below (in particular according to fig. 8). The thread axis here extends coaxially to the screw-in axis or longitudinal axis B. In principle, different embodiments of the clamping means 10 and in particular of the clamping screw 11 can be used. However, it has proven to be advantageous if the clamping screw 11 is embodied, for example, as a countersunk screw.

Fig. 3B and 3C show further details of a specific construction of the milling cutter 9. The view in fig. 3C is a view rotated by 90 ° about the longitudinal axis E relative to the view in fig. 3B, which is perpendicular to the longitudinal axis E of the milling tool 9. The relationship of the viewing directions is shown in more detail in fig. 3D. Fig. 3B corresponds here to a side view from the viewing direction II of fig. 3D, and fig. 3C corresponds to the viewing direction I from fig. 3D.

The main elements of the milling tool 9 are in this embodiment, for example, in direct sequence along the longitudinal axis E, a head region 19, an abutment region 20 adjoining it in a direction away from the tip, a shank region 21 adjoining it in a direction away from the tip, and a clamping region 22 adjoining it in a direction away from the tip. The respective regions are shown in more detail in fig. 3B and 3C with respect to their respective axial extension in the direction of the longitudinal axis E. It is emphasized here that the ratio of the axial lengths of the individual regions to one another can vary, but as is also shown in the exemplary embodiment, the contact region 20 is advantageously at least twice as large, in particular at least 2.5 times as large, in terms of its axial extension than the clamping region 22. This applies independently of the present embodiment.

The head region 19 of the milling cutter 9 comprises a cutter head 23 with a cutter tip 24, which is configured to extend gradually tapering in the direction of the cutter tip 24. Furthermore, the cutter head 23 may have a cutter cap or wear protection cap 25. Fig. 3B and 3C show that the cutting head 23 is essentially designed in such a way that it widens away from the cutting tip 24 along the longitudinal axis E of the milling tool in a radial direction with respect to the longitudinal axis E. In other words, the cutting head is therefore preferably designed at least largely as a cone, wherein variants having surface deformations in the head region, such as slit-like recesses or the like, are thereby also included. The head region 19 essentially represents, as a whole, the portion of the milling tool 9 in the axial direction of the longitudinal axis E, which is in direct contact with the floor material for milling or transfer during the milling operation.

For example, the contact region 20 directly adjoining the head region 19 represents a region of the milling cutter 9 which is arranged essentially for contact in particular directly against the tool holder 8, in particular in the interior of the milling cutter holder, behind the milling cutter receiving opening 15 in the direction of the insertion axis R, as will be explained in more detail below, and is functionally responsible in particular for the force output from the milling cutter 9 to the tool holder 8. This region is therefore preferably also configured to be smaller or narrower in terms of its radial extent than the radial maximum extent of the head region 19 and to be retracted behind this in the radial direction. The abutment region 20 can in particular have an abutment cone 26 at least in part. The abutment cone may be configured as a right-truncated cone with a straight generatrix and a cone axis extending coaxially with the longitudinal axis E, as is shown in more detail by way of example in fig. 3B and 3C. In this case, the contact region 20 can be configured such that the contact cone 26 extends over substantially the entire contact region 20 in the direction of the longitudinal axis E. The outer circumferential surface of the abutment cone 26 can in particular extend at an angle K in the range of 5 ° to 50 ° and more particularly in the range of 10 ° to 30 ° relative to the longitudinal axis E of the milling tool 9. It is also conceivable to bend or otherwise deform the generatrix as long as a section is obtained in which the milling cutter is free of transitions and ideally uniform or continuous (as in the case of cones) away from the nose 24 and tapers just short. In particular, the abrupt step (over which the radial extension of the milling tool 9 is significantly reduced) present in the embodiment between the head region and the abutment region is not part of the abutment region. It is important for the contact area according to the invention that it not only enables contact in the axial direction, but also in the radial direction, as is the case, for example, in the case of the cones contained in the embodiments. This applies in principle to the design of the milling tool according to the invention and should not be understood as being limited to this embodiment only.

In contrast, in the shank region 21 adjoining the abutment region 20 in the rear direction along the longitudinal axis of the milling cutter 9, the milling cutter can be essentially cylindrical in shape, wherein in this region two shank legs 28A and 28B can be present, which are spaced apart from one another in the radial direction by a clamping gap 29. Both legs 28A and 28B open into the abutment cone 26.

At the end of the clamping gap 29 which is arranged in the direction of the nose 24, the clamping gap can transition into a relief opening 30 which extends perpendicularly to the longitudinal axis E. The relief opening 30 can be configured to be partially widened with respect to the width of the clamping gap 29, that is to say the direct radial position of the two legs 28A and 28B, so that, as is shown by way of example in the present exemplary embodiment, a region of smaller material thickness in the radial direction than the thickness of the two legs 28A and 28B is obtained in the region of the relief opening 30. The unloading hole 30 may be constructed in a hollow cylinder shape. The longitudinal axis H of the relief bore 30 extends radially with respect to and intersects the longitudinal axis E of the milling cutter 9, for example. Bending forces acting on the legs 28A and 28B, in particular in the direction of the legs 28A and 28B, in a radial direction relative to the longitudinal axis E or counter to this radial direction, therefore result in a relative movement of the two legs 28A and 28B relative to one another and in a defined relative movement relative to the rest of the milling tool 9, in particular relative to the contact region 20. The bending movement thus achieved is indicated by arrow P in fig. 3C.

The shank region 21 can be essentially cylindrical in shape, which is interrupted only by the clamping gap 29. The diameter of the shank region 21, i.e. the distance of the outer circumferential surface of the shank legs 28A and 28B from the longitudinal axis E of the milling tool 9, can in particular be constant.

The clamping area 22 may be directly adjoined to the shank area 21 along the longitudinal axis E in a direction away from the tip 24. In the clamping area 22, as shown in the present exemplary embodiment, the milling cutter 9 can have, for example, two clamping wedges 31A and 31B, each of which is located on one of the two legs 28A and 28B. The clamping wedges 31A, 31B can project partially beyond the outer circumferential surface of the shank region 21 in the radial direction relative to the longitudinal axis E and have in this region in each case wedge-shaped abutment surfaces 32A, 32B. The abutment surface widens in the radial direction along the longitudinal axis E away from the nose or increases in its radial distance. The clamping wedges 31A and 31B thus each represent a wedge-shaped projection with respect to the shank region 21, which projection extends in a radial direction with respect to the longitudinal axis E of the milling tool 9. The clamping wedges 31A and 31B are not configured to surround the longitudinal axis E of the milling cutter 9, but are alternately segmented in a circumferential direction around the longitudinal axis E. This means that the radial extension of the clamping area 22 alternates between a maximum radial extension Wmax and a minimum radial extension Wmin, seen in the circumferential direction. The milling tool 9 is thus generally T-shaped in the shank region 21 and the clamping region 22 adjoining it. The minimum radial extension Wmin here may correspond to the maximum diameter of the shank region 21. It is important that at least one clamping wedge 31 is present in the clamping region 22, which clamping wedge protrudes in a radial direction relative to the longitudinal axis E or the insertion axis R relative to the shank region 21. The projections obtained by means of the at least one clamping wedge 31 can be used in a manner which will be described in more detail further below in order to clamp the milling cutter 9 with the tool holder 8 in a manner according to the invention.

The clamping wedges 31A and 31B or at least the at least one clamping wedge 31 comprises an abutment surface 32 extending obliquely to the longitudinal axis E and having a generatrix 35 which extends, in particular, at an angle G (fig. 5B) in the range of more than 20 °, in particular more than 35 °, and/or less than 70 °, in particular less than 55 °, in this embodiment, for example, about 45 °, relative to the longitudinal axis E of the milling tool 9. The radial distance of the outer circumferential surface of the respective clamping wedge from the longitudinal axis E increases in the direction away from the nose 24 of the milling tool 9. In general, the milling cutter 9 therefore comprises two contact surfaces (in particular, illustrated by the course of the generatrix 27 and 35) in the contact region 20 and the clamping region 22, which contact surfaces extend in a wedge-shaped manner or extend obliquely relative to one another with respect to the longitudinal axis E in the direction away from the tip 24 of the milling cutter 9, so that the milling cutter 9 as a whole has a constriction at least partially surrounding the longitudinal axis E of the milling cutter, which constriction can be formed by the contact cone 26 and the at least one clamping wedge 31 or the clamping wedges 31A and 31B. These two wedge-shaped contact surfaces, which are arranged behind one another in the direction of the longitudinal axis E of the milling tool 9 away from the nose 24, are used in a manner which will be described in more detail below to clamp the milling tool 9 directly against the tool holder 8.

The milling tool 9 may also have a sliding chamfer and/or guide recess 38, in particular in the region of the milling tool shank and more particularly in the region of the shank legs 28A and 28B, which sliding chamfer and/or guide recess is provided for at least partial engagement with the clamping means 10. The task of the sliding ramp and/or the guide recess 38 is, in particular, to apply a clamping force to the clamping region 22. For this purpose, for example, in the exemplary embodiment shown in fig. 3A to 3D, a hollow conical guide recess 38 (fig. 3A) is provided, which extends between the two clamping wedges 31A and 31B via the clamping gap 29. In the specific embodiment, two mutually opposite conical housing-shaped recesses are arranged for this purpose at the level of the clamping wedges 31A and 31B, which recesses form a guide recess 38 as a whole and are provided for the engagement of the clamping means 10. If the clamping device 10 is driven into this guide recess 38, this results in the two legs 28 opening in the arrow direction W (fig. 3C).

The principle of operation of the previously described exemplary tool holder system 2 is explained in more detail in particular by means of the sectional views of fig. 4A, 4B, 5A and 5B. All these figures show longitudinal sectional views through the tool holder system 2 along the push-in axis R or the longitudinal axis E, as shown in exploded view in fig. 3A. Fig. 4A and 4B show a state in which the milling tool 9 is partially pushed into the tool holder 8. In fig. 5A and 5B, the milling tool 9 is in its end position in a tensioned position with respect to the tool holder 8. Fig. 4A shows the tool holder system 2 in a sectional view according to the section line II 'of fig. 3D, and fig. 4B shows the milling tool holder system in a sectional view according to the section line I' of fig. 3D. In fig. 5A and 5B, the milling cutter 9 is rotated by 90 ° about the insertion axis R or the longitudinal axis E relative to the tool holder 8. Thus, with respect to the tool holder 8, fig. 5A corresponds to the section line II 'in fig. 3D, and fig. 5B corresponds to the section line I'.

The tool holder 8 can be configured as a substantially cylindrical sleeve with a milling tool receiving opening 15 and a clamping means opening 14. The cavity of the tool holder 8 is indicated with 36. In the present exemplary embodiment, the interior space can be accessed only from the outside of the tool holder 8 via the milling tool receiving opening 15 and the clamping device opening 14. In the direction of the insertion axis R, a cone bearing chamber 37, a shank receiving chamber 33 and a clamping wedge receiving chamber 34 can be adjoined successively in the interior chamber 36 on the milling tool receiving opening 15 inside the tool holder 8. The cone bearing chamber 37 is at least partially formed complementarily to the abutment cone 26 of the milling cutter 9 and has at least partially a hollow conical or funnel-shaped inner circumferential surface which tapers from the milling cutter receiving opening 15 radially to the insertion axis R along which it is linearly tapered. The clamping wedge receiving cavity 34 has a substantially circular cross section with a diameter D radially to the push-in axis R. Differently, the stem receiving cavity 33 has a cross-section in the form of a rounded rectangle, with a maximum diameter Cmax and a minimum diameter Cmin perpendicular thereto. The maximum diameter Cmax here corresponds, for example, substantially to the diameter D in the clamping wedge receiving chamber 34. While the minimum diameter Cmin is smaller than the maximum diameter Cmax and the diameter D in the clamping wedge receiving cavity 34. As a result, a undercut 58 is generally obtained in the clamping wedge receiving chamber 34, which undercut is present relative to the shank receiving chamber 33, into which undercut the at least one clamping wedge 31 or the clamping wedges 31A and 31B described in the foregoing for this embodiment can be screwed for clamping the milling tool 9 relative to the tool holder 8. The maximum diameter Cmax of the shank receiving cavity 33 is therefore at least selected such that it is (in the ideal case as least as possible) larger than the maximum extension Wmax of the milling tool 9 in the clamping area 22. In contrast, the minimum diameter Cm in the shank receiving chamber 33 is dimensioned in such a way that it is smaller than the maximum radial extent Wmax of the clamping area 22, but at the same time (in the ideal case as least as possible) larger than the minimum radial extent Wmin of the clamping area 22 of the milling tool 9.

In the direction of the insertion axis E, the tool holder 8 is closed or closed at the end face on the side opposite the milling tool receiving opening 15. The receiving space in the tool holder 8 is thus essentially configured as a blind hole, except for the additional clamping means opening 14. The tool holder 8 preferably comprises in total only two openings to the outside environment, through which openings the interior space is connected to the outside environment, in particular the interior space defined by or delimited by the contact surface 55 for the milling tool 9 against the cone 26, the cone bearing space 37, the shank receiving space 33 and the clamping wedge receiving space 34.

The contact surface 55 with the busbar is configured at least partially and in particular completely complementary to the contact cone 26 or its busbar 27 (fig. 5B). The contact surface 39 (fig. 4B) in the clamping wedge receiving space 34, in particular with the busbar 57, is configured at least partially complementary to the corresponding contact surface of the at least one clamping wedge 31 or of the two clamping wedges 31A and 31B of the milling cutter 9 (fig. 5B).

In general, in the present embodiment, as shown in particular in a comparison of fig. 4A and 4B, the tool holder 8 has a continuously constant radial extension with respect to the insertion axis R of the tool holder 8 in the shank receiving cavity 33 and in the clamping wedge receiving cavity 34, as shown in fig. 4A. In contrast, a 90 ° rotation about this insertion axis R can be provided for the radial constriction or taper of the interior cavity of the tool holder 8, i.e. the radial width of the interior cavity of the tool holder 8, starting from the milling tool receiving opening 15, tapers firstly to a minimum diameter Cmin and then widens again to a diameter D. A undercut 58 is thereby obtained in the clamping wedge receiving chamber 34, which undercut can be used for clamping the milling tool 9 in the tool holder 8.

The clamping means opening 14 is in this exemplary embodiment essentially configured as a hollow cylinder and connects the inner space 36, approximately at the level of the clamping wedge receiving space 34, to the environment of the tool holder 8 on one side in a radial direction relative to the insertion axis R and thus perpendicularly thereto. The clamping means 10 can thus be introduced transversely and in particular perpendicularly to the milling tool receiving opening 15 by means of the clamping means opening 14 and thus from the side of the tool holder 8 in such a way that the clamping means protrudes at least in the tip region into the interior space 36 and in particular at least partially into the clamping wedge receiving space 34 of the tool holder 8.

By the above-described relative dimensioning of the shank region 21 and the clamping region 22 of the milling tool 9 on the one hand and the shank receiving chamber 33 and the clamping wedge receiving chamber 34 of the tool holder 8 on the other hand, the milling tool 9 can thus only be pushed into the tool holder 8 in two positions arranged rotated 180 ° relative to one another. If the milling tool 9 is pushed further into the tool holder 8 along the insertion axis R from the position shown in fig. 4A and 4B until the abutment cone 26 abuts against the inner circumferential surface of the cone bearing cavity 37 of the tool holder 8, the milling tool reaches its insertion end position. The milling tool 9 cannot then be pushed further along the push axis R into the tool holder 8.

Next, the milling tool can be rotated by about 90 ° about the insertion axis R in order to screw at least one clamping wedge 31 (in this example, in particular two clamping wedges 31A and 31B) into the undercut 58 of the clamping wedge receiving chamber 34 of the tool holder 8. As a result of this screwing-in movement, the clamping wedges 31A and 31B overlap the above-described taper between the shank receiving cavity 33 and the milling tool receiving opening 15 as seen in the direction of the insertion axis R or the counter-clamping undercut 58 as seen in the direction of the insertion axis R toward the nose 24, as a result of which a positive locking or locking of the milling tool 9 in the tool holder 8 is obtained. The milling tool 9 can correspondingly not be pulled out of the tool holder 8 from this rotated position.

It can furthermore be provided that the tool carrier system 2 has a rotation stop acting between the milling tool 9 and the tool carrier 8. This ensures that the milling cutter 9 reaches its screwed-in end position from the pushed-in end position in a defined manner. However, in addition or alternatively, this can also be ensured by the fact that the clamping means 10 can fix the milling cutter only in a defined relative position of the milling cutter 9 with respect to the tool holder. For example, if a thread is present on the milling tool 9, this is the case, into which thread the clamping means should be inserted in order to clamp the milling tool 9, in particular for opening the shank.

By the above-described screwing movement, the guide recess 38 of the milling tool 9 reaches a relative position opposite the clamping device opening 14 of the tool holder 8, in particular in a radial direction relative to the insertion axis R. The clamping means 10 can thus be inserted from the outside of the tool holder 8 and can engage in the guide recess 38. By means of the conical design of the clamping means 10 or of the tip region of the clamping screw 11, which is described in more detail below, the clamping means continue into the guide recess and thus in particular also into the region between the two legs, with the result that the two legs 28A and 28B are pressed apart relative to one another. The clamping wedges 31A and 31B are thus pressed simultaneously away from each other in the direction of the arrow W, i.e. in the radial direction relative to the push-in axis. The force acting in the direction of introduction of the clamping device 10 is thus converted into an opening force extending substantially perpendicularly thereto. This opening movement results in the abutment surfaces 32A and 32B of the clamping wedges 31A and 31B in the clamping wedge receiving chamber 34 being pressed against the abutment surface 39 of the clamping wedge receiving chamber 34 which extends obliquely to the insertion axis R and is at least partially formed substantially complementarily thereto. The orientation of the contact surface 39, which is oriented obliquely to the axis of rotation or the insertion axis R, ultimately makes it possible to convert this opening force into a tensile force acting on the milling tool 9, which force enters the interior of the tool holder 8 in the direction of the insertion axis R. The end result is that the milling tool 9 is thereby pulled further along the insertion axis R into the tool holder 8 or the abutment cone 26 is pulled with a clamping force toward the inner circumferential surface of the cone bearing cavity 37 of the tool holder 8. The milling tool 9 is thus pulled directly and itself into a fixed, rotationally fixed clamping end position toward the tool holder 8. In this position, the milling tool for milling operation is fixed in a rotationally fixed manner in the tool holder 8 in a manner ready for operation.

The possibility of modifying the design of the tool holder system 2 according to the invention described above also exists for the design of the engagement of the clamping means 10 in the tool holder 8 and/or in the milling tool 9. A different exemplary alternative to this is illustrated in more detail in accordance with the region 48 in fig. 5A, which is shown enlarged in fig. 8. The clamping means 10 embodied as a clamping screw 11 can have a substantially cylindrical outer circumferential surface 50 in the region of a screw head 49, which in particular can also have a recess 17 for a tool engagement, which outer circumferential surface can be embodied as smooth-walled or in particular can also have an external thread (indicated by T1 in fig. 8, for example). The external thread has a thread axis extending coaxially with respect to the screwing axis B. For this purpose, a suitable internal thread (also in fig. 8 part T1) can be provided in the region of the clamping means opening 14 of the tool holder 8. This region is indicated at 51 in fig. 8. In this case, the clamping means 10 thus act in the tool holder 8 by means of a threaded engagement. Additionally or alternatively, the clamping means may have a cylindrical region offset in the longitudinal direction of the clamping means 10 from the screw head 49 towards the screw tip, for example also having a reduced diameter relative to the screw head 49 relative to the screwing axis B. The region 52 may be wall-smooth or at least partially externally threaded (indicated by T2 in fig. 8 for example). Furthermore, the clamping means may additionally or alternatively have, in particular in the region of the clamping means tip 53 or in the region 54 forming the clamping means tip 53, an expansion cone section which tapers, in particular away from the recess 17 or the screw head 49. In other words, the tip is preferably configured to be tapered. The expansion cone section can likewise be configured wall-smooth or at least partially with an external thread (indicated by T3 in fig. 8 for example). For the regions 51 and/or 54 of the clamping means 10, in particular of the clamping screw 11, at least partially complementarily configured regions 55, 56 can be provided in the milling tool 9, in particular at the level of the clamping region 22, which regions are configured for engagement by the regions 51 and/or 54 (and for this purpose can have, for example, complementary threads or at least thread sections). The region 55 is here a hollow cylindrical shell-shaped recess in the region of the legs 28A and 28B facing one another. Region 56 is a hollow cone-shaped recess in the region of legs 28A and 28B facing each other. Thus, not only region 55 but also additionally or alternatively region 56 may have at least in part an internal thread or internal thread section extending about the screw-in axis B, which internal thread or internal thread section is at least in part complementarily disposed with respect to the respective mating thread(s) T2 and T3 in region 51 and/or 54 on clamping device 10. The interaction of the regions 51 and/or 54 of the clamping means 10 with the regions 55 and/or 56 of the milling tool 9 results in this case in a threaded engagement between the clamping means 10 and the milling tool 9.

In particular, fig. 5A illustrates the function of the sealing element or sealing cap 13. The sealing element is fitted onto the clamping mechanism or the clamping means from the outside of the tool holder 8 and extends in a hood-like manner over the clamping means 10 or the head region thereof, which is accessible from the outside of the tool holder, whereby the clamping means is shielded from the outside environment. This prevents wear phenomena on the clamping part 10 or the addition of existing openings, for example polygonal recesses, for engagement of the screwing tool due to dirt and grime.

Fig. 5A also shows the operation of the sealing ring 12. The sealing ring can extend annularly about the longitudinal axis E and/or the insertion axis R. The sealing ring is clamped in the axial direction of the insertion axis E between an abutment surface 44 of the milling cutter 9 extending in the radial direction relative to the insertion axis R and a mating abutment surface 45 of the tool holder 8 extending at the level of or surrounding the milling cutter receiving opening 15 and in the radial direction relative to the insertion axis R. The sealing ring 12 thus effects a sealing action, in particular of the milling cutter receiving opening 15, which in the present embodiment is closed in particular by the milling cutter 9. The sealing ring 12 now improves this sealing, so that the penetration of dirt particles and/or moisture, in particular into the gap between the milling cutter 9 and the tool holder 8, is greatly reduced.

The cross-sectional views according to fig. 4A to 5B also show a preferred basic structure of the milling cutter 9. The milling tool can in particular comprise a base body 46, in particular a steel base body, in particular a hardened and tempered steel base body, for example made of spring steel, which preferably forms the entire contact region 20 in one piece and in a solid manner, including the inner parts of the contact cone 26, the shank region 21 and the clamping region 22, and the head region 19. Furthermore, the head region 19 preferably comprises a wear protection cap or bonnet 25 which is fitted over the base body 46. The wear protection cap is connected to the base body 46, for example by brazing, and forms outwardly a substantially conical wear protection structure which constitutes at least a major part of the outer surface of the head region 19. The knife cap 25 may in particular be made of a hard metal in order to effectively overcome the wear phenomena that occur. The nose may be formed by a cap 25. But it is also possible to place a tip 24 separate from the material on the cap 25. It is preferred here to refer to a tip 24 having PCD material (polycrystalline diamond). The nose may be connected to the cap 25, in particular by a brazing method, in particular brazing. The elements 46, 25 and 24 are thus firmly and non-detachably connected to each other, so that the milling cutter 9 as a whole constitutes a one-piece overall structure.

Fig. 6 now illustrates the main steps of the method according to the invention for mounting a milling tool in a tool holder. For a specific embodiment of the milling tool and the tool holder, reference is made here, for example, also in particular to the exemplary embodiments of the milling tool 9 and the tool holder 8 described above and the disclosure relating thereto.

In step 40, it is first provided that the milling tool is pushed along the insertion axis into the interior of the tool holder. This can also be derived, for example, from fig. 3A, 4A and 4B. The milling tool is pushed in until it reaches the pushed-in end position. The insertion end position therefore represents a position in which the milling tool cannot be inserted further into the tool holder along the insertion axis. This end position can be achieved, for example, by a stop of the abutment cone of the milling cutter on an abutment surface of an at least partially complementary hollow cone in the interior of the tool holder.

According to step 41, at least one clamping wedge of the milling tool is introduced into the clamping wedge receiving cavity in the interior of the tool holder following the insertion movement, in particular along the insertion axis R. This can be achieved in particular by rotating the milling tool about the insertion axis R, in particular by at least approximately 90 °, in order to screw the clamping wedge into the clamping wedge receiving chamber. The milling tool is thereby brought into a pre-clamping position relative to the tool holder, starting from which the milling tool is fixed in the tool holder according to step 42 by the subsequent introduction of the clamping means.

When the clamping means is introduced in accordance with step 42, the clamping means exert a clamping force on the milling tool, in particular by screwing in a clamping screw as the clamping means. The milling tool is brought by the clamping force into a clamping end position in which it is pressed with its at least one clamping wedge against the inner wall of the clamping wedge receiving space and at the same time is pulled into the tool holder with the abutment region abutting onto the head region for abutment against the tool holder. In this case, the clamping force acting on the milling tool by means of the clamping means serves in particular to generate a mutual opening of at least two legs in the radial direction relative to the longitudinal axis of the milling tool in the clamping wedge receiving space, which legs are separated from one another in the radial direction by a clamping gap. The expansion movement here extends in particular perpendicularly to the screwing direction of the clamping means relative to the milling tool. The axis of rotation along which the clamping means is screwed into the tool holder and/or the milling tool preferably extends obliquely or transversely, in particular perpendicularly, to the axis of insertion of the milling tool into the milling tool holder.

Finally, fig. 7 shows a floor milling machine 43, in this example a cold milling machine, for removing street paving and/or street markings in the area of a lane repair. Such machines are known per se from the prior art. Such a machine comprises a milling roller 1 arranged in a milling roller housing, which milling roller is rotatable during operation about a rotation axis R extending horizontally and transversely to the working direction a. Details of the construction of such milling rollers are already given in fig. 1A to 2B.

Fig. 9A to 9H show further embodiments of the tool holder system 2 according to the invention. Here, the existing differences from the above-described embodiments are emphasized in particular below. Furthermore, reference is made to the embodiments of the foregoing examples, in particular according to fig. 3A to 5B and 8.

In this embodiment, the main difference is an alternative design of the guide recess 38, in which the guide recess does not extend between the two legs 28A and 28B, but extends through the leg 28A toward the second leg 28B. For this purpose, it can be provided that the clamping means opening 14 has an internal thread in the tool holder 8 for the engagement of the clamping means 10, in particular of the clamping screw 11. However, it is preferred that the guide recess 38 for a positive-locking engagement, which is located entirely in the first shank 28A, has an internal thread which is complementary to the external thread located on the clamping screw 11. It is further preferred that no internal thread is provided in the region of the clamping means opening 14 of the tool holder 8. As a result, when the clamping screw 11 is tightened, the two legs 28A and 28B are acted upon with a clamping force in opposite directions to one another and are thus pressed apart from one another in opposite directions in a radial direction relative to the longitudinal axis E and/or the insertion axis R. As long as the tool holder 8 has no internal thread in the clamping means opening 14, the clamping means opening is not worn out by the multi-generation milling tool. Thus, such a tool holder 8 can be used over a relatively long period of time.

This embodiment also has the advantage that the clamping screw 11 can be pushed into the tool holder 8 in the mounted state already screwed into the first shank 28A and thus pre-mounted, as is shown for example in fig. 9A. The clamping screw 11 therefore does not have to pass through the clamping means opening 14 of the tool holder 8 afterwards. The clamping means opening 14 is used in this embodiment for passing through a suitable screwing tool. This significantly simplifies the replacement process of the milling tool 9.

Fig. 9C, 9D and 9E summarize the mounting process of the milling tool in the tool holder 8 in time sequence. These together with the clamping screw 11 form a mounting unit 47 which can also be sold as a whole in this form. From this perspective, the longitudinal cross-sectional view of fig. 9C is rotated 90 ° relative to the longitudinal cross-sectional view of fig. 9D. From this perspective, fig. 9C corresponds to section line II 'of fig. 3D, and fig. 9D corresponds to section line I' of fig. 3D. In this case, fig. 9D in particular shows that the clamping means 10 is dimensioned with respect to its axial extension in the direction of its screw-in axis B such that the clamping means is free of projections with respect to the maximum radial extension of the clamping wedge 31A. The radial lumen diameter Cmin is correspondingly greater than the axial extension of the clamping device 10. During the insertion of the milling tool 9 into the tool holder 8, the screw-in axis B and the clamping device opening 14 thereby extend in different radial directions with respect to the longitudinal axis E and/or the insertion axis R. In fig. 9E, the milling tool 9 is rotated by 90 ° relative to the tool holder 8 after it has been pushed into its end position, as a result of which the clamping means 10 or the screw-in axis B is brought into conformity with the clamping means opening 14. If the clamping means 10, in particular the clamping screw 11, is now screwed further in the direction of the shank 28B, the clamping means 10 presses the second shank 28B and the first shank 28A (as long as there is an internal thread which engages the clamping means 10) away from one another in a radial direction relative to the longitudinal axis E and/or the insertion axis R and thus presses the two clamping wedges 31A and 31B radially into the clamping wedge receiving chamber 34. The abutment surfaces 32A and 32B of the clamping wedges 31A and 31B, which are arranged obliquely to the longitudinal axis E and/or the insertion axis R (as described above), thus abut against the abutment surfaces 39 of the undercut 58, which are at least partially complementary. In this way, a tensile force is exerted on the milling tool 9 in the direction of insertion of the milling tool into the tool holder 8, and thus the milling tool 9 is fixed with its abutment cone 26 in the clamping region 22 in the tool holder 8.

Fig. 9F, 9G and 9H further illustrate this action and structure of the tool holder 8. The plan view in the interior of the tool holder 8 according to fig. 9F shows first of all a design of a push-in opening for the milling tool 9, which has the shape of a rounded rectangle with a maximum diameter Cmax of the shank receiving cavity 33 and a minimum diameter Cm perpendicular to the maximum diameter. Further, in fig. 9F, the radial peripheral edge of the undercut 58 is indicated by a broken line. The radial periphery is configured circularly around the longitudinal axis E and/or the insertion axis R and forms a free space which is concave outwards relative to the shank receiving space 33 in the radial direction relative to the longitudinal axis E and/or the insertion axis R in the region of the smallest diameter Cm of the shank receiving space 33. The clamping wedge 31 is screwed into this free space in the manner described above, as is further illustrated by a comparison of fig. 9G and 9H. These two figures show cross-sectional views transversely to the longitudinal axis E and/or the insertion axis R along the section line III in fig. 9E. In fig. 9G, the milling tool 9 is in the pushed-in end position. In contrast, in fig. 9H, starting from fig. 9G, the milling tool is rotated by 90 ° about the longitudinal axis E and/or the insertion axis R and accordingly is in its clamped end position (in particular with the clamping screw 11 being screwed down). For further illustration, fig. 9G and 9H show the views there of the clamping device opening 14 covered by the tool holder 8 and the course of the screw-in axis B.

It is also possible in principle for the shank receiving chamber 33 to have one or more insertion guides, for example threading grooves 65, which extend in particular parallel to the longitudinal axis E and/or the insertion axis R. In this case, this may be longitudinally extending widenings which are formed in the shank receiving space 33 and into which complementary regions of the milling tool 9 can engage in a form-fitting manner. In this case, the insertion guides, in particular the insertion grooves 65, extend, for example, from the cone bearing chamber 37 in the axial direction relative to the longitudinal axis E and/or the insertion axis R through the entire shank receiving chamber 33 or only through the entire shank receiving chamber. It can thus be ensured, for example, that the milling cutter 9 can only be pushed into the tool holder 8 from a relative rotational position with respect to the tool holder 8. This may simplify, in particular, the correct orientation of the clamping device opening 14 relative to the clamping device 10 and/or the guiding recess 38. This is achieved by the positive-locking, rotation about the longitudinal axis E and/or the insertion axis R being counteracted by means of the insertion guide.

Fig. 9B also shows a milling cutter rotary tool 60, by means of which in particular a rotary movement of the milling cutter 9 about the insertion axis R and/or the longitudinal axis E can be made easier in order to bring one or more clamping wedges 31, 31A, 31B into the region of the undercut 58. For this purpose, milling tool rotary tool 60 is designed for positive engagement with head region 19 of milling tool 9, wherein a positive engagement in the circumferential direction about insertion axis R and/or longitudinal axis E is to be provided. For this purpose, one or more projections 61A and/or recesses 61B may be provided in the outer circumferential surface of the tool bit 23, in particular of the tool cap 25. In the region of the projection 61A, the outer circumferential surface extends in a radial direction relative to the insertion axis R and/or the longitudinal axis E, offset outwardly relative to the recess 61B, in particular with respect to E and/or R, at the same axial level. The projection 41A and the recess 61B thus form one or more steps in the circumferential direction relative to the insertion axis R and/or the longitudinal axis E. The projection 61A and/or recess 61B may taper in the axial direction towards the nose with respect to its maximum radial extension along the push-in axis R and/or the longitudinal axis E.

Milling cutter rotary tool 60 may have at least one engagement projection and/or recess 62A, 62B. The at least one engagement projection and/or recess 62A, 62B is a means of at least partially complementary engagement into the tool engagement, in particular comprising at least one projection 61A and/or recess 61B. The engagement is performed such that, in a tool rotary tool engaged in the tool engagement, a positive fit is achieved in the circumferential direction about the longitudinal axis E and/or the insertion axis R of the milling tool 9. The milling tool rotary tool 60 can have an annular tool region 63, on the inner circumferential surface of which the engagement projections 62A and the engagement recesses 62B are alternately arranged circumferentially, in particular at the same angular distance from one another. Here, the angular distance is preferably complementary to the angular distance of the protrusions 61A and the recesses 61B alternately arranged around the tip 23. Thus, starting from the nose 24, the milling tool rotary tool 60 can be pushed onto the tool head 23, in particular the tool cap 25, so that the milling tool rotary tool surrounds the tool head 23 from the outside, wherein for this purpose the engagement projection 62A engages into the recess 61B and the engagement recess 62B surrounds the projection 61A. As a result, a plurality of form fits are obtained in the circumferential direction relative to the insertion axis R and/or the longitudinal axis E.

To facilitate the rotational movement of the milling cutter rotary tool 60, the milling cutter rotary tool may comprise a rotary lever 64 adjoining and projecting sideways from a tool region 63. However, various alternative modifications are also conceivable here. The tool region 63 can also be formed, in particular, for example, by a tool sleeve or the like, in order to be able to be driven in rotation, for example, by means of a motor-driven adjusting device, for example pneumatically, hydraulically or electrically.

Further basic possibilities for constructing the milling cutter 9, which are independent of the construction and the mode of operation of the tool holder system 2, are likewise shown in more detail in particular in fig. 9C, 9D and 9E. A feature is that a cavity 66 is provided between the cap 25, which is preferably made of a hard metal, in particular comprising tungsten carbide and/or cobalt as components, and the base 46 (in particular also comprising the handle as described above) connected to the cap 25. The cavity may be surrounded only by the cap 25 and the base 46. The cap 25 thus rests directly on the base body 46 essentially via the annular abutment surface 67 (and not entirely). The direct contact area between the cap 25 and the base 46 can preferably be used to braze the two components to each other. Boron nitride, for example, may also be used, whether in the nose or the cap.

In order to ensure a correct relative orientation of the knife cap 25 with respect to the base body 46, in particular during the production process, a positioning aid 68 can preferably be provided on the base body 46. The positioning aid 68 can be designed such that it brings about a positive relative orientation of the two parts to one another, which orientation acts in a form-fitting manner in the radial and/or axial direction relative to the insertion axis R and/or the longitudinal axis E. For example, a chamfer 69 is provided for this purpose in the present exemplary embodiment, which chamfer surrounds the insertion axis R and/or the longitudinal axis E on the outer surface of the base body 46 facing the tool cap 25, in particular in an annular manner. Here, the chamfer 69 has a circumferential surface tapering conically toward the tip, by means of which centering is facilitated in the sense of pre-adjusting the cap 25 relative to the base body 46.

Fig. 10A, 10B and 10C show further embodiments of a tool holder system 2 according to the invention. Here, the existing differences from the above-described embodiments are emphasized in particular below. Furthermore, reference is made to the embodiments of the foregoing examples, in particular according to fig. 3A to 5B and 8 and fig. 9A to 9H.

The embodiment shown in fig. 10A, 10B and 10C is peculiar in that, unlike the previous embodiments, no clamping wedge is provided on the milling tool 9 and thus no clamping wedge receiving cavity with a corresponding undercut is provided in the tool holder. Whereas in the grip part 18, a hole, in particular in the form of a through-hole, is present in the clamping region 22, which corresponds functionally to the guide recess 38. In order to fix the milling tool 9 in the tool holder 8, the milling tool 9 is pushed into the tool holder 8 along the insertion axis R and/or the longitudinal axis E until the milling tool reaches its insertion end position. The milling tool 9 is now rotated into a position in which the guide recess 38 reaches a position of overlap with the clamping device opening 14 in the tool holder 8. Next, the clamping means 10, for example in the form of a cone, is introduced from outside the tool holder 8 into the clamping means opening 14. This can be done by the clamping means 10 passing completely through the shank along the screw-in axis B and being inserted into an internal thread, which can be part of a blind hole or else a hole open to the outside, in the interior of the tool holder 8 opposite the clamping means opening 14. Additionally or alternatively, the clamping means opening 14 may also have an internal thread for engagement by the clamping means 10 thread. It is now important that the guide recess 38 is, for example, in the form of a conical through-hole, the longitudinal or conical axis of which extends obliquely and in particular radially to the insertion axis R and/or the longitudinal axis E. When screwing in the clamping means 10, the clamping means sliding on the inner side of the guide recess 38 causes a tensile force acting on the milling cutter 9 via the conical recess, via which the abutment cone 26 is pulled towards the cone abutment surface of the cone bearing chamber 37.

It is possible that this embodiment is equipped with a shank 28 in the manner already described. However, a continuous shank can also be used, and thus in particular the provision of the clamping gap 29 can also be dispensed with.

Fig. 11 shows further aspects of the invention relating to the design of the knife cap 25 and the base 46. What is important in this embodiment of the invention is the cavity 66 enclosed by the cap 25 and the base 46. The cavity occupies a relatively large volume proportion of the milling tool 9 and is provided for the presence of a hollow volume in the milling part of the milling tool 9. In particular, the total volume of cavity 66 significantly exceeds the solder reservoir used in connecting two metal parts. The cavity 66 is hollow in nature and is not filled with any solid material. The cavity has an extension EL in the direction of the longitudinal axis E of the milling cutter 9 and an extension ER in the radial direction with respect to the longitudinal axis E of the milling cutter 9. The radial extension ER decreases from the maximum radial extension ER formed by the axially lower end of the base body at the base of the cavity 66 toward the nose, since the radially outer wall of the cavity, which is formed by the cap, is inclined at an angle W1 relative to the longitudinal axis E of the milling tool, which, independently of the specific embodiment, is preferably less than 35 °, in particular less than 30 °. Regardless of the particular embodiment, it is in principle preferred that the maximum radial extension ER of the cavity 66 is greater than the extension EL of the cavity 66 in the direction of the longitudinal axis E. The cavity 66 is delimited in the direction towards the nose or upwards by a crown 71 constituted by the cap 25. The cavity is delimited away from the tip in the direction of the longitudinal axis E or downward by a bottom region 72 formed by the base body 46. Both the crown 71 and the sole region 72 may be configured in a disc shape and extend parallel to each other. The angle W4 between the conical inner surface of the cavity 66 and the substantially flat head top is preferably greater than 90 °, particularly preferably greater than 100 ° and/or less than 150 °, preferably less than 140 °.

The tool cap 25 has an extension EK in the direction of the longitudinal axis E of the milling tool 9. The cavity 66 is now configured to enclose the space in such a way that the cavity extends with its axial extension EL to the blade cap over at least 50% of the axial extension EK.

Furthermore, the present embodiment also shows a preferred configuration of the abutment region between the knife cap 25 and the base 46. In contrast to the radially flat configuration of the contact region shown in fig. 9C to 9E, for example, the contact surfaces between the two elements are preferably conically configured complementary to one another. For this purpose, the cap has, in its end region facing away from the cutting head, a radially outer abutment surface 67, which is arranged at an angle W2 in the direction of the cutting tip and completely uniformly surrounds the longitudinal axis, in the form of a cone which tapers away from the cutting tip in the direction of the longitudinal axis E. For this purpose, the base body has, in its outer region in the radial direction relative to the longitudinal axis E, a receiving surface 70 which tapers conically or funnel-shaped toward the longitudinal axis E away from the tip. In this way, a positive-locking fastening between the tool cap and the tool base body, which is effective in the radial direction relative to the longitudinal axis E and which is complementary to one another in the direct contact region, is achieved, which not only facilitates the assembly, but also enables a particularly effective force output of the forces introduced into the tool nose during the milling operation, as is currently shown by the arrows P1, P2 and P3.

The contact or abutment area between the cap 25 and the base body 46 comprises an axial extension EB in the direction of the longitudinal axis E of the milling tool 9. Towards the tip, the region EB extends from the cavity or the cavity extends towards the tip beyond the region EB. The radial extension EC of the contact and abutment region can be configured as shown in fig. 11 such that the abutment region is external in the radial direction with respect to the abutment cone 26.

Furthermore, in the embodiment shown in fig. 11, an alternative design of the tool cap 25 is important in that it protrudes over the entire tool base body in the radial direction with respect to the longitudinal axis E of the milling tool or at least ends flush with the tool base body. The cap thus effectively protects the region of the milling cutter that adjoins the cap in the direction of the longitudinal axis E, starting from the nose.

In the transition region between the base surface and the receiving surface 70 or in the contact region between the tool cap 25 and the base body 46, the tool base body comprises a recess in the form of an annular groove 73 relative to the base surface. This annular groove 73 surrounding the longitudinal axis E makes it easy to mount the protective cap 25 on the tool base body, preferably by means of a soldering process.

In the above-mentioned abutment region between the cap 25 and the base body 46, the cap 25 is fastened to the tool base body, preferably by means of a soldered connection.

Claims

1. A tool carrier system (2) comprising a milling tool (9), a tool carrier (8) and a clamping device (10),

the milling cutter (9) comprises:

a cutting head (23) having a cutting tip (24), wherein the cutting head (23) widens in a head region (19) away from the cutting tip (24) along a longitudinal axis (E) of the milling tool (9) in a radial direction relative to the longitudinal axis (E),

an abutment region (20) abutting on the head region (19), the abutment region being configured to abut on the tool holder (8), the abutment region (20) having at least in part an abutment cone (26) tapering in a radial direction in a direction away from the tool tip (24),

a shank region (21) adjoining the abutment region (20),

a clamping region (22) adjoining the shank region (21),

wherein the milling tool has a guide recess (38) in the clamping region, into which the clamping means (10) is inserted,

the tool holder (8) configured to hold a sleeve comprises:

a) An end-side milling tool receiving opening (15),

b) A shank receiving cavity (33) which adjoins the milling tool receiving opening (15) in the direction of the insertion axis (R) of the milling tool (9) and which extends into the interior of the holding sleeve,

c) And a clamping means opening (14) extending transversely to the push-in axis (R) of the shank receiving cavity, which provides an access connection from the outside of the holding sleeve around the push-in axis (R) up to the shank receiving cavity, and through which the clamping means (10) can be inserted for fixing the milling tool (9) in the tool holder (8),

wherein,,

a through-hole is present in the shank in the clamping region (22),

the conical clamping means (10) is introduced from outside the tool holder (8) into the clamping means opening (14), passes completely through the through-opening of the tool shank along the screw-in axis (B) and is screwed into an internal thread inside the tool holder (8) opposite the clamping means opening (14),

the clamping element opening (14) has an internal thread for threaded engagement by the clamping element (10),

the guide recess (38) is formed as a conical through-hole, the longitudinal or conical axis of which extends obliquely to the insertion axis (R) and/or the longitudinal axis (E),

when screwing in the clamping means (10), the clamping means (10) sliding on the inner side of the guide recess (38) causes a tensile force acting on the milling tool (9) via the conical guide recess, by means of which the abutment cone (26) is pulled towards the cone abutment surface of the cone bearing cavity (37) of the tool holder (8).

2. The tool post system according to claim 1,

it is characterized in that the method comprises the steps of,

the abutment region (20) is directly adjacent to the head region (19).

3. The tool post system according to claim 1,

it is characterized in that the method comprises the steps of,

the shank region (21) is directly adjacent to the abutment region (20).

4. The tool post system according to claim 1,

it is characterized in that the method comprises the steps of,

the clamping region (22) is directly adjacent to the shank region (21).

5. The tool post system according to any one of claims 1 to 4,

it is characterized in that the method comprises the steps of,

the abutment cone (26) is designed as a truncated cone.

6. The tool post system according to any one of claims 1 to 4,

it is characterized in that the method comprises the steps of,

the clamping means (10) is a clamping screw (11).

7. The tool post system according to claim 6,

it is characterized in that the method comprises the steps of,

the clamping screw (11) has a recess (17) for a positive-locking engagement of the screwing tool.

8. The tool post system according to any one of claims 1 to 4,

it is characterized in that the method comprises the steps of,

the tool holder (8) has a sleeve base with a bottom wall which closes an interior space present inside the tool holder (8) along an insertion axis (R) on the opposite end side from the milling tool receiving opening (15).

9. The tool post system according to claim 8,

it is characterized in that the method comprises the steps of,

the bottom wall, on the end opposite the milling tool receiving opening (15), completely closes an interior space present inside the tool holder (8) along a push-in axis (R).

10. The tool post system according to any one of claims 1 to 4,

it is characterized in that the method comprises the steps of,

the tool holder (8) has only an end-side milling tool receiving opening (15) and a clamping means opening (14) extending transversely to the insertion axis (R) of the shank receiving chamber as a connection opening to the environment outside the interior space of the tool holder (8).

11. Milling roller (1) having at least one tool carrier system according to any one of claims 1 to 10.

12. Milling roll (1) according to claim 11, characterized in that the milling roll (1) is a finish milling roll.

13. A floor milling machine with milling rollers (1) according to claim 11 or 12.

14. The ground milling machine of claim 13, wherein the ground milling machine is a cold milling machine.